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CBSE 2022 SCIENCE Including Competency Based Questions CLASS 10 Term 1 Chapter-wise MCQ Bank Purchase Hard book From Amazon www.cbse.online

MCQ Bank Science Class 10 Term 1 Edition 2021 Copyright © By Nodia and Company Information contained in this book has been obtained by author, from sources believes to be reliable. However, neither www.cbse.online nor its author guarantee the accuracy or completeness of any information herein, and www.cbse.online nor its author shall be responsible for any error, omissions, or damages arising out of use of this information. This book is published with the understanding that www.cbse.online and its author are supplying information but are not attempting to render engineering or other professional services. ISBN : 978-9384843618 Published by Nodia and Company MRP Rs 460.00 This book is available on amazon only and not available in market. www.cbse.online Published by Nodia and Company 126, Sector 6, Vidyadhar Nagar, Jaipur 302039 Phone :+91 9001005245

Contents 5-59 60-118 CHAP 1. Chemical Reaction and Equations 119-169 CHAP 2. Acids, Bases and Salts 170-239 CHAP 3. Metal and Non Metals 240-316 CHAP 4. Life Processes 317-350 CHAP 5. Light- Reflection and Refraction CHAP 6. Human Eye and Colorful World Don’t Take Printout of This File because this is not useful. You can purchase hard book from Amazon. Hard book includes explanation of all MCQs in print form.

Available Also : MCQ Bank for CBSE 2022 Term 1 Class 10th Science Social Science English HINDI SANSKRIT These question bank are available on Amazon. Scan QR Code to Purchase MCQ Bank

This PDF is review version of hard book available on Amazon. In hard book full explanation are given with question. Chap 2 Chemical Reactions amd Equations Page 5

CHAPTER 2 C
hemical Reaction and Equation 2.1 introduction 2.2 Chemical Equation Chemistry is the branch of science in which 2.2.1 Word Equation we study the composition, properties and transformation of matter. We observe changes A word equation simply shows the change of in matter all around us. These changes are of reactants to products through an arrow placed two types: between them. The reactants are written on the left-hand side (LHS) with a plus sign in case 2.1.1 Physical Change of two or more reactants and the products are written on the right-hand side (RHS) with a A change in which there is a change in physical plus sign in case of two or more products. The appearance of a substance but no change in its arrowhead shows the direction of the reaction basic composition, is known as a physical change. pointing towards the products. For example, melting of butter and wax, boiling of water, dissolving of salt in water, breaking of 2.2.2 Skeletal Chemical Equation glass, sublimation of a solid on heating, etc. No new chemical substance is formed in a physical A chemical equation in which symbols and change. formulae are used instead of words to show a chemical reaction is called a skeletal chemical 2.1.2 Chemical Change equation. A change in which one or more new substances 2.2.3 Balanced Chemical Equation having properties and compositions different from the original substance are formed, is known A chemical equation in which the number of as a chemical change. For example, burning atoms of each element of reactants is equal to of paper, wood, coal and magnesium ribbon, that of products, is called a balanced chemical making of curd from milk, digestion of food, equation. ripening of fruits, bursting of a cracker, boiling of egg, etc. Chemical changes are also called 2.2.4 Balancing a Chemical Equation chemical reactions. Equalising the number of atoms of each element A chemical reaction is accompanied on reactants and products sides of a chemical by changes in physical state, formation of equation is called balancing a chemical equation. a precipitate, change of colour, change in 1. A chemical equation can be made more temperature or evolution of a gas. informative by adding physical states of Normally, a chemical change is permanent reactants and products, reaction conditions, and cannot be reversed easily. heat change during the reaction, i.e., heat released or absorbed, concentration of reactants and products, speed or rate of the reaction, i.e., slow or fast, and nature of the reaction, i.e., forward or backward to the To Purchase Hard Book of From Amazon Click Here. For More Details Whatsapp at 8905629969

Page 6 For Answer and Explanation Question Click the Link in Pink Color. Chap 2 Chemical Reactions amd Equations equation. Potassium (K) Most reactive 2.2.5 Characteristics of Chemical Equations Sodium (Na) Least reactive Calcium (Ca) 1. Chemical equation gives the names of Magnesium (Mg) different reactants and products of a chemical Aluminium (Al) reaction. Zinc (Zn) Iron (Fe) 2. It gives the number of atoms or molecules Lead (Pb) of reactants and products of a chemical Copper (Cu) reaction. Silver (Ag) Gold (Au) 3. Chemical equation gives relative number of Platinum (Pt) moles of reactants and products. 4. It gives the relative amount by mass or weight of reactants and products. 5. Chemical equation also gives relative volume of gaseous reactants and products. 2.3 Types of Chemical Reactions Activity series of some common metals 2.3.1 Combination Reaction Few examples of displacement reactions are as follows: A reaction in which two or more substances 1. Displacement of copper from a solution of combine together to form a single product is copper sulphate by iron known as a combination reaction. Fe (s) + CuSO4(aq) \" Cu (s) + FeSO4(aq) The combination reaction is often called 2. Displacement of silver from silver nitrate solution by copper synthesis. MgO (s) + H2O (l) Heat Mg (OH)2(aq) Cu (s) + 2AgNO3(aq) \" 2Ag (s) Magnesium oxide Water Magnesium hydroxide +Cu (NO3)2(aq) 3. Displacement of iron from iron sulphate +Heat solution by magnesium 2.3.2 Decomposition Reaction The reaction in which a single substance Mg (s) + FeSO4(aq) \" MgSO4(aq) + Fe (s) breaks down to form two or more substances, is called a decomposition reaction. For example, 4. Zinc displaces hydrogen from dilute sulphuric decomposition of FeSO4 on heating. acid. 2FeSO4(s) Heat Fe2O3(s) + SO2(g) +SO3(g) Zn (s) + dil.H2SO4(aq) \" ZnSO4(aq) Ferric oxide +H2(g) - 2.3.3 Displacement Reaction 2.3.4 Double Displacement Reaction The reaction in which one atom or a group of atoms of a compound is replaced by another The reaction in which anions and cations of two atom, is called a displacement reaction. Generally, different molecules exchange places, forming two a more reactive metal displaces a less reactive completely different compounds, is called double metal from its salt solution in displacement displacement reaction. For example, reaction. Na2SO4(aq) + BaCl2(aq) \" BaSO4(s) . The series in which metals are arranged in Sodium Barium Barium the decreasing order of their reactivity is called sulphate chloride sulphate activity series of metals. +2NaCl (aq) Sodium chloride To Purchase Hard Book of From Amazon Click Here. For More Details Whatsapp at 8905629969

This PDF is review version of hard book available on Amazon. In hard book full explanation are given with question. Chap 2 Chemical Reactions amd Equations Page 7 The common types of double displacement 2.3.6 Electronic Concept of Oxidation and reactions are as follows: Reduction 1. Precipitation Reaction : It is a chemical Oxidation is the loss of electrons by a species reaction in which one of the products is (an atom, a molecule or an ion). precipitated as an insoluble solid. For example, K $ K+ + e− AgNO3(aq) + NaCl (aq) \" AgCl (s) . Zn + Zn2+ $ 2e− (White ppt.) Reduction is the gain of electrons by a species +NaNO3(aq) (an atom, a molecule or an ion). 2. Neutralisation Reaction : It is chemical Ag+ + e− $ Ag reaction in which a strong acid and a strong base react with each other to form water and S + 3e− $ S2− salt. For example, 1. Exothermic Reaction : A chemical reaction NaOH (aq) + HCl (aq) \" NaCl (aq) + H2O (l) in which heat is released along with the formation of product, is called exothermic 2.3.5 Redox Reaction reaction. For example, 1. Oxidation : If a substance gains oxygen or C (s) + O2(g) $ CO2(g) + Heat loses hydrogen in a reaction, the substance is said to be oxidised and the process is known CaO (s) + H2O (l) $ Ca (OH)2(aq) + Heat as oxidation. Calcium oxide Water Calcium hydroxide 2. Reduction : If a substance loses oxygen and (Lime) (Slaked lime) gains hydrogen in a reaction, the substance is said to be reduced and the process involved 2. Endothermic Reaction : A chemical reaction is known as reduction. in which heat is absorbed along with the formation of product, is called endothermic Reduction and oxidation take place reaction. For example, simultaneously in few reactions. Such reactions are known as redox reactions. NH4Cl (s) + H2O (l) $ NH4Cl (aq) − Heat 3. Oxidising Agent : If a substance oxidises the N2(g) + O2(g) $ 2NO (g) − Heat other substance but itself gets reduced, then it is known as an oxidising agent. 2.3.7 Corrosion 4. Reducing Agent : If a substance reduces the It is the process of slow conversion of metals into other substance but itself gets oxidised, then their undesirable compounds by the attack of air it is known as a reducing agent. (oxygen) and moisture. 1. Rusting : When iron and iron articles are For example, exposed to air and water, a reddish-brown MgO + H2 $ Mg + H2O layer is formed on the surface. This layer is called rust [hydrated iron(III) oxide, Here, H2 is the reducing agent as it reduces Fe2O3 $ x H2O]. Hence, corrosion of iron is MgO to Mg and itself gets oxidised to H2O. On the other hand, magnesium oxide is the oxidising agent which oxidises H2 to H2O and itself gets reduced to Mg. Thus, an oxidising agent gets reduced and a reducing agent gets oxidised in a redox reaction. To Purchase Hard Book of From Amazon Click Here. For More Details Whatsapp at 8905629969

Page 8 For Answer and Explanation Question Click the Link in Pink Color. Chap 2 Chemical Reactions amd Equations known as rusting.

mulitiple choice QUESTION 2. Rancidity : When cooked food items 1. A solution of substance X is used for white containing oil and fat are kept exposed washing. Here X is: and unprotected, they become rancid and (a) CaO produce an unpleasant smell and taste. (b) CaO2 The phenomenon involved here is known as (c) NaCl rancidity. (d) KCl 3. Prevention of Rancidity : Rancidity can be Sol : www.cbse.site/sc/am101 prevented by adding antioxidants, keeping food items at low temperature, keeping food items in vacuum packing or airtight container and replacing air by nitrogen gas.

****** 2. Which of the following statements about the reaction below are incorrect? Don’t Take Printout of This File because this is not useful. You can purchase hard 2PbO (s) + C (s) $ 2Pb (s) + CO2(g) book from Amazon. Hard book includes explanation of all MCQs in print form. 1. Lead is getting reduced. 2. Carbon dioxide is getting oxidised. 3. Carbon is getting oxidised. 4. Lead oxide is getting reduced. (a) 1 and 2 (b) 1 and 3 (c) 1, 2 and 3 (d) all of the above Sol : www.cbse.site/sc/am102 3. Fe2O3 + 2Al $ Al2O3 + 2Fe The above reaction is an example of a (a) combination reaction. (b) double displacement reaction. (c) decomposition reaction. (d) displacement reaction. Sol : www.cbse.site/sc/am103 4. What happens when dilute hydrochloric acid is added to iron fillings? (a) Hydrogen gas and iron chloride are produced. (b) Chlorine gas and iron hydroxide are produced. To Purchase Hard Book of From Amazon Click Here. For More Details Whatsapp at 8905629969

This PDF is review version of hard book available on Amazon. In hard book full explanation are given with question. Chap 2 Chemical Reactions amd Equations Page 9 (c) No reaction takes place. $ Cu (NO3)2(aq) + 2Ag (s) (d) Iron salt and water are produced. Sol : www.cbse.site/sc/am104 (b) CuCO3(s) Heat CuO (s) + CO2(g) (c) N2(g) + 3H2(g) $ 2H3(g) 5. Identify the substances that is oxidized (d) AgNO3(aq) + NaCl (aq) and the substances that is reduced in the $ AgCl (s) + NaNO3(aq) following reactions: 4Na (s) + O2(g) $ 2Na2O (s) Sol : www.cbse.site/sc/am108 (a) Na, O2 (b) Na, Na 9. Which one of the following is the example (c) O2, Na of oxidation? (d) O2, O2 (a) 2Mg (s) + O2(g) Burning 2MgO (s) Sol : www.cbse.site/sc/am105 (b) CuO (s) + H2(g) Heat Cu (s) + H2O (g) 6. Identify the substances that is oxidized and the substances that is reduced in the (c) Fe2O3(s) + 2Al (s) $ Al2O3(s) following reactions: CuO (s) + H2(g) $ Cu (s) + H2O (l) +2Fe (s) (a) H2, CuO (b) H2, H2O (d) None of these (c) H2, Cu (d) Cu, H2 Sol : www.cbse.site/sc/am109 Sol : www.cbse.site/sc/am106 10. A shiny brown coloured element X on heating in air becomes black in colour. HereX is: (a) Copper (b) Silver (c) Aluminium (d) Mercury Sol : www.cbse.site/sc/am110 7. Translate the following statement into the 11. Which of the following statement is correct chemical equation and choose the correct regarding to physical changes? option “Hydrogen gas combines with (a) In physical change, new substance is nitrogen to form ammonia.” formed. (a) 3H2(g) + N2(g) $ 2NH3(g) (b) H2(g) + N2(g) $ NH2(g) (b) In physical change, no new substance (c) 2H (g) + N2(g) $ 2NH3 is formed. (d) None of these (c) In physical change, chemical composi- Sol : www.cbse.site/sc/am107 tion of substance is changed. 8. Which one of the following is the example (d) None of these of precipitation reaction? (a) Cu (s) + 2AgNO3(aq) Sol : www.cbse.site/sc/am111 To Purchase Hard Book of From Amazon Click Here. For More Details Whatsapp at 8905629969

Page 10 For Answer and Explanation Question Click the Link in Pink Color. Chap 2 Chemical Reactions amd Equations 12. FeS + H2SO4 $ FeSO4 + H2S -. (a) PbI2 In the above equation - indicates: (b) PbNO3 (a) gas evolved (c) Pb (NO3)2 (b) insoluble substance formed (d) PbIO3 (c) reactive element Sol : www.cbse.site/sc/am116 (d) element is not useful in chemical equation 17. Which of the following is not a chemical Sol : www.cbse.site/sc/am112 reaction? (a) Souring of milk 13. CaO (s) + H2O (l) $ X (s) + Heat (b) Dissolution of sugar in water + Hissing sound. (c) Rusting of iron Here X is: (d) Digestion of food in the body (a) Cu(OH) Sol : www.cbse.site/sc/am117 (b) Cu (OH)2 (c) 2CaOH 18. Na2CO3 + XHCl $ 2NaCl + CO2 + H2O (d) Ca2OH In above reaction, the value of X is: Sol : www.cbse.site/sc/am113 (a) 1 (b) 2 14. The balancing of chemical equation is (c) 3 based on: (d) 4 (a) Law of conservation of energy Sol : www.cbse.site/sc/am118 (b) Law of conservation of mass (c) Law of conservation of heat 19. PCl5(s) + XH2O (l) $ YH3PO4(aq) (d) None of these +ZHCl (aq). Sol : www.cbse.site/sc/am114 The value of X,Y and Z are: (a) X -4, Y -3, Z -3 15. When white silver chloride is left exposed (b) X -4, Y -1, Z -5 to sunlight, it colours becomes: (c) X -1, Y -2, Z -3 (a) Gray (d) X -5, Y -1, Z -2 (b) Yellow Sol : www.cbse.site/sc/am119 (c) Green (d) Red 20. What happens when ferrous sulphate Sol : www.cbse.site/sc/am115 crystals are heated? (a) A gas having the smell of burning 16. Complete the following chemical reaction sulphur is evolved. with correct option: (b) No gas is evolved. Pb (NO3)2 + 2KI $ .......... + 2KNO3 (c) Brown coloured gas is evolved. To Purchase Hard Book of From Amazon Click Here. For More Details Whatsapp at 8905629969

This PDF is review version of hard book available on Amazon. In hard book full explanation are given with question. Chap 2 Chemical Reactions amd Equations Page 11 (d) Colourless and odourless gas is called .......... reaction. evolved. (a) Decomposition (b) Combination Sol : www.cbse.site/sc/am120 (c) Precipitation (d) Displacement 21. In the reaction Br2 + 2I $ 2Br− + I2, the oxidising agent is: Sol : www.cbse.site/sc/am124 (a) Br2 (b) I- 25. Which of the following example is a (c) Br- decomposition reaction? (d) I2 (a) Evaporation of water Sol : www.cbse.site/sc/am121 (b) Exposure of photographic film in the presence of light Don’t Take Printout of This File because (c) Heating sulphur in the presence of this is not useful. You can purchase hard oxygen book from Amazon. Hard book includes (d) Dissolving salt in water explanation of all MCQs in print form. Sol : www.cbse.site/sc/am125 22. Which of the following is not a thermal 26. When petrol, in the presence of oxygen gas, decomposition reaction? burns inside the engine of a car, carbon (a) 2KClO3 $ 2KCl + 3O2 dioxide and water are produced. The (b) ZnCO3 $ ZnO + CO2 temperature inside the engine becomes very (c) 2FeSO4 $ Fe2O3 + SO2 + SO3 high. Which of the following statements is (d) 2H2O $ 2H2 + O2 correct? (a) The burning of petrol is an example of Sol : www.cbse.site/sc/am122 a physical change. 23. Y + 2HCl $ ZnCl2 + H2. In the above (b) Heat energy is taken out from the reaction, Y is: surroundings. (a) Aluminium (b) Copper (c) Oxygen and petrol are the reactants (c) Sodium in this process. (d) Zinc (d) This process is triggered by light Sol : www.cbse.site/sc/am123 energy. Sol : www.cbse.site/sc/am126 24. The chemical reactions in which one element takes the position or place of another element present in a compound are To Purchase Hard Book of From Amazon Click Here. For More Details Whatsapp at 8905629969

Page 12 For Answer and Explanation Question Click the Link in Pink Color. Chap 2 Chemical Reactions amd Equations 27. Calcium oxide reacts vigorously with water. (b) a displacement reaction (c) a decomposition reaction (d) a double displacement reaction Sol : www.cbse.site/sc/am129 Identify the incorrect statements. 30. 3MnO2 + 4Al $ 3Mn + 2Al2O3 1. It is an endothermic reaction. The oxidising agent in the above reaction 2. Slaked lime is produced. is: 3. Quick lime is produced. (a) MnO2 4. It is an exothermic reaction. (b) Al 5. It is a combination reaction. (c) Mn (a) 1 and 2 (d) Al2O3 (b) 3 and 4 Sol : www.cbse.site/sc/am130 (c) 1 and 3 (d) 2, 4 and 5 31. Which of the following processes does not involve either oxidation or reduction? Sol : www.cbse.site/sc/am127 (a) Formation of slaked lime from quick lime 28. Which of the following statements about (b) Heating mercuric oxide the reaction given below are incorrect? (c) Formation of manganese chloride from manganese oxide 2PbO (s) + C (s) $ 2Pb (s) + CO2(g) (d) Formation of zinc from zinc blend Sol : www.cbse.site/sc/am131 1. Lead is getting reduced. 2. Carbon dioxide is getting oxidised. 32. The given diagram represents a .......... 3. Carbon is getting oxidised. reaction. 4. Lead oxide is getting reduced. (a) 1 and 2 (b) 3 and 4 (c) 1 and 3 (d) 2 and 4 Sol : www.cbse.site/sc/am128 29. When hydrogen sulphide gas is passed (a) Thermal decomposition through a blue solution of copper sulphate, (b) Displacement a black precipitate of copper sulphide is (c) Double displacement obtained and the sulphuric acid so formed remains in the solution. The reaction is an example of (a) a combination reaction To Purchase Hard Book of From Amazon Click Here. For More Details Whatsapp at 8905629969

This PDF is review version of hard book available on Amazon. In hard book full explanation are given with question. Chap 2 Chemical Reactions amd Equations Page 13 (d) Combination 3. Water is acting as reducing agent. Sol : www.cbse.site/sc/am132 4. Water is acting as oxidising agent. (a) 1, 2 and 3 33. On burning magnesium ribbon in air, it (b) 3 and 4 is observed that it burns brightly leaving (c) 1, 2 and 4 behind a .......... powder. (d) 2 and 4 (a) White (b) Green Sol : www.cbse.site/sc/am136 (c) Yellow (d) Black 37. Which of the following are exothermic Sol : www.cbse.site/sc/am133 processes? 1. Reaction of water with quick lime. 34. Which of the following is not a physical 2. Dilution of an acid. change? 3. Evaporation of water. (a) Boiling of water to give water vapour 4. Sublimation of camphor (crystals). (b) Melting or ice to give water (a) 1 and 2 (c) Dissolution of salt in water (b) 2 and 3 (d) Combustion of Liquefied Petroleum (c) 1 and 4 Gas (LPG) (d) 3 and 4 Sol : www.cbse.site/sc/am134 Sol : www.cbse.site/sc/am137 35. The following reaction is an example of a 4NH3(g) + 5O2(g) $ 4NO (g) + 4H2O (g) 38. A dilute ferrous sulphate solution was 1. displacement reaction gradually added to the beaker containing 2. combination reaction acidified permanganate solution. The light 3. redox reaction purple colour of the solution fades and 4. neutralisation reaction finally disappears. (a) 1 and 4 Which of the following is the correct (b) 2 and 3 explanation for the observation? (c) 1 and 3 (a) KMnO4 is an oxidising agent, it (d) 3 and 4 oxidises FeSO4. Sol : www.cbse.site/sc/am135 (b) FeSO4 acts as an oxidising agent and oxidises KMnO4. 36. Which of the following statements about (c) The colour disappears due to dilution; the given reaction are correct? no reaction is involved. 3Fe (s) + 4H2O (g) $ Fe3O4(s) + 4H2(g) (d) KMnO4 is an unstable compound and 1. Iron metal is getting oxidised. decomposes in presence of FeSO4 to a 2. Water is getting reduced. colourless compound. Sol : www.cbse.site/sc/am138 39. Which among the following is (are) double To Purchase Hard Book of From Amazon Click Here. For More Details Whatsapp at 8905629969

Page 14 For Answer and Explanation Question Click the Link in Pink Color. Chap 2 Chemical Reactions amd Equations displacement reaction(s)? (b) 2 and 3 1. Pb + CuCl2 $ PbCl2 + Cu (c) 1 and 4 2. Na2SO4 + BaCl2 $ BaSO4 + 2NaCl (d) 3 and 4 3. C + O2 $ CO2 4. CH4 + 2O2 $ CO2 + 2H2O Sol : www.cbse.site/sc/am141 (a) 1 and 4 (b) Only 2 42. Barium chloride on reacting with (c) 1 and 2 ammonium sulphate forms barium sulphate (d) 3 and 4 and ammonium chloride. Which of the following correctly represents the type of Sol : www.cbse.site/sc/am139 the reaction involved? 1. Displacement reaction 40. Which among the following statement(s) 2. Precipitation reaction is(are) true? 3. Combination reaction Exposure of silver chloride to sunlight for a 4. Double displacement reaction long duration turns grey due to (a) Only 1 1. the formation of silver by decomposition of silver chloride. (b) Only 2 2. sublimation of silver chloride. 3. decomposition of chlorine gas from silver (c) Only 4 chloride. 4. oxidation of silver chloride. (d) 2 and 4 (a) Only 1 (b) 1 and 3 Sol : www.cbse.site/sc/am142 (c) 2 and 3 (d) Only 4 43. Electrolysis of water is a decomposition reaction. The mole ratio of hydrogen and Sol : www.cbse.site/sc/am140 oxygen gases liberated during electrolysis of water is 41. Solid calcium oxide reacts vigorously (a) 1 : 1 with water to form calcium hydroxide (b) 2 : 1 accompanied by liberation of heat. This (c) 4 : 1 process is called slaking of lime. Calcium (d) 1 : 2 hydroxide dissolves in water to form its solution called lime water. Which among Sol : www.cbse.site/sc/am143 the following is (are) true about slaking of lime and the solution formed? 44. Which of the following is(are) an 1. It is an endothermic reaction. endothermic process(es)? 2. It is an exothermic reaction. 1. Dilution of sulphuric acid 3. The pH of the resulting solution will be 2. Sublimation of dry ice more than seven. 3. Condensation of water vapours 4. The pH of the resulting solution will be 4. Evaporation of water less than seven. (a) 1 and 3 (a) 1 and 2 (b) Only 2 (c) Only 3 To Purchase Hard Book of From Amazon Click Here. For More Details Whatsapp at 8905629969

This PDF is review version of hard book available on Amazon. In hard book full explanation are given with question. Chap 2 Chemical Reactions amd Equations Page 15 (d) 2 and 4 48. Which one of the following processes involve Sol : www.cbse.site/sc/am144 chemical reactions? (a) Storing of oxygen gas under pressure 45. In the double displacement reaction in a gas cylinder between aqueous potassium iodide and (b) Liquefaction of air aqueous lead nitrate, a yellow precipitate (c) Keeping petrol in a china dish in the of lead iodide is formed. While performing open the activity if lead nitrate is not available, (d) Heating copper wire in presence of air which of the following can be used in place at high temperature of lead nitrate? (a) Lead sulphate (insoluble) Sol : www.cbse.site/sc/am148 (b) Lead acetate 49. In which of the following chemical equations, the abbreviations represent the (c) Ammonium nitrate correct states of the reactants and products involved at reaction temperature? (d) Potassium sulphate (a) 2H2(I) + O2(I) $ 2H2O (g) (b) 2H2(g) + O2(I) $ 2H2O (I) Sol : www.cbse.site/sc/am145 (c) 2H2(g) + O2(g) $ 2H2O (I) (d) 2H2(g) + O2(g) $ 2H2O (g) 46. Which of the following gases can be used Sol : www.cbse.site/sc/am149 for storage of fresh sample of an oil for a long time? 50. Which of the following are combination (a) Carbon dioxide or oxygen reaction? (b) Nitrogen or oxygen 1. 2KClO3 Heat 2KCl + 3O2 (c) Carbon dioxide or helium 2. MgO + H2O $ Mg (OH)2 (d) Helium or nitrogen 3. 4Al + 3O2 $ 2Al2O3 4. Zn + FeSO4 $ ZnSO4 + Fe Sol : www.cbse.site/sc/am146 (a) 1 and 3 (b) 3 and 4 47. The following reaction is used for the (c) 2 and 4 preparation of oxygen gas in the laboratory (d) 2 and 3 Heat 2KClO 3 (s) Catalyst 2KCl (s) + 3O2(g) Sol : www.cbse.site/sc/am150 Which of the following statement(s) is(are) 51. The addition of hydrogen to a substance is known as: correct about the reaction? (a) Oxidation (b) Reduction (a) It is a decomposition reaction and (c) Redox reaction (d) Precipitation endothermic in nature. (b) It is a combination reaction. (c) It is a decomposition reaction and accompanied by release of heat. (d) It is a photochemical decomposition reaction and exothermic in nature. Sol : www.cbse.site/sc/am147 To Purchase Hard Book of From Amazon Click Here. For More Details Whatsapp at 8905629969

Page 16 For Answer and Explanation Question Click the Link in Pink Color. Chap 2 Chemical Reactions amd Equations Sol : www.cbse.site/sc/am151 55. Oxygen gas reacts with hydrogen to produce water. The reaction is represented 52. The oxidation of oils or fats in a food is by the equation: known as: O2(g) + H2(g) $ H2O (I) (a) Corrosion The above reaction is an example of (b) Rust 1. Oxidation of hydrogen (c) Rancidity 2. Reduction of oxygen (d) Oxidisation 3. Reduction of hydrogen 4. Redox reaction Sol : www.cbse.site/sc/am152 (a) 1, 2 and 3 (b) 2, 3 and 4 53. The necessary conditions for combustion (c) 1, 3 and 4 precess to occur are (d) 1, 2 and 4 1. availability of air/oxygen. 2. availability or air/oxygen and fuel. Sol : www.cbse.site/sc/am155 3. temperature of fuel below ignition tem- perature. 56. Compound A on strong heating in a boiling 4. temperature of fuel above ignition tem- tube gives off reddish brown fumes and a perature. yellow residue. When the aqueous solution Select the correct alternative. of A is treated with few drops of sodium (a) 1 and 2 hydroxide solution, a white precipitate (b) 2 and 4 appeared. Identify the cation and anion (c) 3 and 1 present in the compound A. (d) 4 and 1 (a) Copper(II) and nitrate (b) Lead(II) and chloride Sol : www.cbse.site/sc/am153 (c) Zinc and sulphate (d) Lead(II) and nitrate 54. The reaction between carbon and oxygen can be represented as Sol : www.cbse.site/sc/am156 C (s) + O2(g) T CO2(g) + Heat In which of the following type(s), the above 57. Magnesium ribbon is rubbed with sand reaction can be classified? paper before making it to burn. The reason 1. Combustion reaction of rubbing the ribbon is to: 2. Displacement reaction (a) remove moisture condensed over the 3. Endothermic reaction surface of ribbon. 4. Combination reaction (b) generate heat due to exothermic (a) 1 and 3 reaction. (b) 1, 3 and 4 (c) remove magnesium oxide formed over (c) 1 and 4 the surface of magnesium. (d) 1 Only (d) mix silicon from sand paper (silicon dioxide) with magnesium for lowering Sol : www.cbse.site/sc/am154 ignition temperature of the ribbon. Sol : www.cbse.site/sc/am157 To Purchase Hard Book of From Amazon Click Here. For More Details Whatsapp at 8905629969

This PDF is review version of hard book available on Amazon. In hard book full explanation are given with question. Chap 2 Chemical Reactions amd Equations Page 17 58. Which of the following is a feasible reaction? 62. An integer precedes the formula of each (a) Ba (s) + K2SO4(aq) $ BaSO4(aq) substance; is known as .......... coefficients. (a) chemical +2K (s) (b) physical (c) stoichiometric (b) (d) thermal Zn (s) + 2AgNO3(aq) $ Zn (NO3)2(aq) Sol : www.cbse.site/sc/am162 +2Ag (s) 63. 2Mg (s) + O2(g) $ 2MgO (s) The stoichiometric coefficient of O2 is: (c) (a) 1 (b) 2 Mg (s) + Na2SO4(aq) $ MgSO4(aq) (c) 3 (d) 4 +2Na (s) Sol : www.cbse.site/sc/am163 (d) Cu (s) + MgSO4(aq) $ CuSO4(aq) 64. The statement of law of conservation of +Mg (s) mass is: (a) mass can neither be created nor Sol : www.cbse.site/sc/am158 destroy. (b) mass can be created nor destroy. 59. The symbolic representation of an actual (c) mass of the body cannot be remain chemical change is known as same. (a) Chemical equation (d) none of these. (b) Chemical formula (c) Chemical symbol Sol : www.cbse.site/sc/am164 (d) Physical formula 65. Which of the following statement is correct Sol : www.cbse.site/sc/am159 regarding to chemical equation? (a) A chemical equation does not indicate 60. Which of the following chemical reaction is about the condition for the reaction. correct? (b) It gives the idea about the rate of (a) 2Mg (s) + O2(g) $ 2MgO (s) reaction. (b) 2Mg (s) + O2(g) $ MgO + O2 (c) It gives the information about the (c) Mg (s) + O2 $ 2MgO (s) heat. (d) 2Mg (s) + 2O2 $ 2MgO + O2 (d) It gives idea about the mechanism of the reaction. Sol : www.cbse.site/sc/am160 Sol : www.cbse.site/sc/am165 61. N2 + 3H2 $ 2NH3 In the above reaction and products are: Reactants Products (a) N2, H2 NH 3 (b) NH3 N2, H2 (c) N2 H2, NH3 (d) N2NH3 H2 Sol : www.cbse.site/sc/am161 To Purchase Hard Book of From Amazon Click Here. For More Details Whatsapp at 8905629969

Page 18 For Answer and Explanation Question Click the Link in Pink Color. Chap 2 Chemical Reactions amd Equations 66. Which one of the following is the exothermic reaction? decomposition reaction? (a) N2 + 3H2 $ 2NH3 + Heat (a) H2 + Cl2 Sunlight 2HCl (b) N2 + O2 $ 2NO − Heat (b) 2Mg + O2 Heat 2MgO (c) CuO + H2 $ Cu + H2O (c) CaO + H2O $ Ca (OH)2 (d) Mg + Cl2 $ MgCl2 (d) 2KClO3 $ 2KCl + 3O2 Sol : www.cbse.site/sc/am170 Sol : www.cbse.site/sc/am166 67. The oxidation and reduction takes place 71. Which of the following is the factor of simultaneously in .......... reaction. influence the corrosion? (a) displacement (a) Reactivity of metals (b) redox (b) Presence of impunities (c) combination (c) Strain in the metal (d) decomposition (d) All of the above Sol : www.cbse.site/sc/am167 Sol : www.cbse.site/sc/am171 68. Which of the following is correct regarding 72. Which method is used for preventing the oxidizing agent? corrosions? (a) It gives oxygen for oxidation. (a) Galvanization (b) It does not gives oxygen for oxidation. (b) Electroplating (c) It does not remove hydrogen. (c) Both (a) and (b) (d) It gives oxygen and does not remove (d) Thermosetting hydrogen. Sol : www.cbse.site/sc/am172 Sol : www.cbse.site/sc/am168 73. BaCl2 + H2SO4 $ X BaSO4 + Y HCl The value of X and Y in the above chemical 69. CuO + H2 $ Cu + H2O equation are: Which of the following pair is correct (a) 1, 2 regarding to oxidation and reduction? (b) 2, 1 (c) 1, 1 Oxidation Reduction (d) 1, 3 (a) CuO H2 Sol : www.cbse.site/sc/am173 (b) H2 CuO (c) H2O H2 74. The balancing chemical equation of (d) H2 H2O following statement is: “Silver bromide on exposure to sunlight Sol : www.cbse.site/sc/am169 decomposes into silver and bromine”. (a) 2AgBr $ 2Ag + Br 70. Which of the following equation is To Purchase Hard Book of From Amazon Click Here. For More Details Whatsapp at 8905629969

This PDF is review version of hard book available on Amazon. In hard book full explanation are given with question. Chap 2 Chemical Reactions amd Equations Page 19 (b) 2AgBr Sunlight 2Ag + Br2 78. Which of the following pair is incorrect? (c) 2AgBr Sunlight Ag + Br2 (d) AgBr Sunlight Ag + 2Br Sol : www.cbse.site/sc/am174 Reaction Reaction Name 75. The indication of chemical reaction in an (a) CH4 + 2O2 \" CO2 Combustion activity is/are: +2H2O reaction and (a) change in state oxidation (b) change in colour (c) change in temperature reaction (d) all of the above (b) Pb (NO3)2 + 2KI Double Sol : www.cbse.site/sc/am175 \" PbI2 + 2KNO3 displacement and precipitation reaction 76. When potassium iodine solution is added (c) CaO + H2O Combination to a solution of lead nitrate .......... reaction occurs. \" Ca (OH)2 reaction (a) combination (b) decomposition (d) CuSO4 + Zn Combination (c) displacement (d) redox \" ZnSO4 + Cu reaction Sol : www.cbse.site/sc/am176 Sol : www.cbse.site/sc/am178 77. X + Barium chloride $ Y + Sodi- 79. Which one reaction shows the property of um chloride (White ppt) double displacement reaction? (a) CuSO4 + Zn $ ZnSO4 + Cu Here X and Y are: (b) Cu + 2AgNO3 $ Cu (NO3)2 + 2Ag (c) NaOH + HCl $ NaCl + H2O (a) NaSO4, BaSO4 (d) None of these (b) BaSO4, Na2SO4 Sol : www.cbse.site/sc/am179 (c) BaSO2, NaSO4 (d) Na2SO4, BaSO4 80. When the powder of a common metal is heated in an open china dish, its colour Sol : www.cbse.site/sc/am177 turns black. However, when hydrogen is passed over the hot black substance so Don’t Take Printout of This File because formed, it regains its original colour. this is not useful. You can purchase hard Which type of chemical reaction take place book from Amazon. Hard book includes in each step? explanation of all MCQs in print form. (a) oxidation, redox (b) redox, oxidation (c) oxidation, oxidation To Purchase Hard Book of From Amazon Click Here. For More Details Whatsapp at 8905629969

Page 20 For Answer and Explanation Question Click the Link in Pink Color. Chap 2 Chemical Reactions amd Equations (d) redox, redox 84. Which of the following reaction shows the Sol : www.cbse.site/sc/am180 change in colour? (a) Cu + 2AgNO3 $ Cu (NO3)2 + 2Ag 81. Which one of the following pair is correct? (b) NaOH + HCl $ NaCl + H2O + Heat Reaction Reaction Type (c) Pb (NO3)2 + 2KI $ PbI2 + 2KNO3 (d) None of these. (a) 2KNO3(s) Displacement Sol : www.cbse.site/sc/am184 \" 2KNO2(s) reaction + O 2 (g) 85. Which reaction is used in photography? (a) CaO + H2O $ Ca (OH)2 + Heat (b) Zn (s) + 2AgNO3(aq) Combination (b) 2FeSO4 Heat Fe2O3 + SO2 + SO3 (c) 2Cu + O2 $ 2CuO \" Zn (NO3)2 reaction (d) 2AgBr sunlight 2Ag + Br Sol : www.cbse.site/sc/am185 +2Ag (s) 86. Which metal have maximum reactivity? (c) Ni (NO3)2(aq) Double (a) K + 2NaOH displacement (b) Na \" Ni (OH)2 . reaction and (c) Au + 2NaNO 3 (aq) precipitation (d) Pt reaction Sol : www.cbse.site/sc/am186 (d) N2(g) + 3H2(g) Decomposition 87. The physical change is: \" 2NH3(g) reaction (a) melting of butter (b) burning of paper Sol : www.cbse.site/sc/am181 (c) digestion of food (d) bursting of crackers 82. 3MnO2 + 4Al $ 3Mn + 2Al2O3 The reducing agent in the above equation is: (a) Al (b) Mn (c) C2 (d) Mn, O2 Sol : www.cbse.site/sc/am182 83. Which of the following reaction represents Sol : www.cbse.site/sc/am187 the rusting of iron? (a) Fe4+ $ Fe3+ + e− 88. Which of the following is the chemical (b) C + O2 $ CO2 + Heat change? (c) 4Fe + 3O2 Moisture 2Fe2O3 (a) burning of paper (d) C + O2 $ CO2 + Heat (b) boiling of water (c) breaking of glass Sol : www.cbse.site/sc/am183 (d) melting of butter Sol : www.cbse.site/sc/am188 To Purchase Hard Book of From Amazon Click Here. For More Details Whatsapp at 8905629969

This PDF is review version of hard book available on Amazon. In hard book full explanation are given with question. Chap 2 Chemical Reactions amd Equations Page 21 89. What happens when dilute hydrochloric displacement reaction? acid is added to iron fillings? (a) NaOH + HNO3 \" NaNO3 + H2O (a) Hydrogen gas and iron chloride are (b) Cu + 2AgNO3 \" Cu (NO3)2 + 2Ag produced. (c) 2Hg + O2 \" 2HgO (b) Chlorine gas and iron hydroxide are (d) FeCl3 + 2NaOH \" 3NaCl + Fe (OH)3 produced. (c) No reaction takes place. Sol : www.cbse.site/sc/am193 (d) Iron salt and water are produced. 94. The reaction in which two compounds Sol : www.cbse.site/sc/am189 exchange their ions to form two new compounds is called: 90. The reaction 2Na + Cl2 $ 2NaCl is an (a) displacement reaction example of (b) decomposition reaction (a) combination reaction (c) isomerization reaction (b) decomposition reaction (d) metathesis reaction or double (c) displacement reaction decomposition reaction (d) double displacement reaction Sol : www.cbse.site/sc/am194 Sol : www.cbse.site/sc/am190 91. Which of the following reactions involves 95. When hydrogen sulphide gas is passed the combination of two element? through a blue solution of copper sulphate, a black precipitate of copper sulphide is (a) CaO + CO2 $ CaCO3 obtained and the sulphuric acid so formed remains in the solution. The reaction is an (b) 4Na + O2 $ 2N2O example of: (a) combination reaction (c) SO 2 + 1 O2 $ SO 3 (b) displacement reaction 2 (c) decomposition reaction (d) double displacement reaction (d) NH3 + HCl $ NH4Cl Sol : www.cbse.site/sc/am195 Sol : www.cbse.site/sc/am191 96. When the gases sulphur dioxide and 92. When lead nitrate is heated, it breaks down hydrogen sulphide mix in the presence of into lead monoxide, nitrogen dioxide and water, the following reaction takes places: oxygen. SO2 + 2H2S $ 2H2O + 3S 2Pb (NO3)2 $ 2PbO + 4NO2 + O2 Here, hydrogen sulphide is acting as: The reaction is an example of: (a) an oxidizing agent (a) Combination reaction (b) a reducing agent (c) a dehydrating agent (b) Decomposition reaction (d) a catalyst (c) Double displacement reaction Sol : www.cbse.site/sc/am196 (d) Displacement reaction Sol : www.cbse.site/sc/am192 93. Which of the following is an example of To Purchase Hard Book of From Amazon Click Here. For More Details Whatsapp at 8905629969

Page 22 For Answer and Explanation Question Click the Link in Pink Color. Chap 2 Chemical Reactions amd Equations 97. In the reaction: Sol : www.cbse.site/sc/am200 2FeCl2 + Cl2 $ 2FeCl3 Chlorine may be regarded as: 101. Which of the following is correct for a (a) an oxidizing agent physical change? (b) a reducing agent 1. Only physical properties change. (c) a catalyst 2. Large amount of heat is absorbed or (d) providing an inert medium evolved. Which of the above statements is/are Sol : www.cbse.site/sc/am197 correct? (a) Only 1 98. Which of the following is not a balanced (b) Only 2 equation? (c) Both 1 and 2 (a) Ca (HO)2 + CO2 $ CaCO3 + H2O (d) Neither 1 and 2 (b) Fe + CuSO4 $ FeSO4 + Cu (c) KClO4 T KCl + 2O2 Sol : www.cbse.site/sc/am201 (d) Cu + 2HNO3 $ Cu (NO3)2 + 2NO2 +H2O 102. Which of the following is not a chemical Sol : www.cbse.site/sc/am198 change? (a) Burning of a candle. 99. Fe2O3 + 2Al $ Al2O3 + 2Fe (b) Cooking a food (a) Combination reaction (c) Sublimation (b) Double displacement reaction (d) Germination of seeds (c) Decomposition reaction (d) Displacement reaction Sol : www.cbse.site/sc/am202 Sol : www.cbse.site/sc/am199 103. Rusting of iron can be prevented by: 1. Painting 100. Which of the following are correctly 2. Galvanisation matched? 3. Electrolytic refining 4. Alloying 1. Dissolution Solute gets dissolved Which of the above are correct? in a solvent. (a) 1, 2 and 3 (b) 1, 2 and 4 2. Exothermic Heat in absorbed. (c) 2, 3 and 4 (d) 1, 2, 3 and 4 3. Reversible Reactants can be change obtained. Sol : www.cbse.site/sc/am203 Which of the above are correct? 104. Which of the following is the observations (a) 1 and 2 of the chemical reaction? 1. Change in state (b) 2 and 3 2. Evolution of a gas (c) 1 and 3 (d) 1, 2 and 3 To Purchase Hard Book of From Amazon Click Here. For More Details Whatsapp at 8905629969

This PDF is review version of hard book available on Amazon. In hard book full explanation are given with question. Chap 2 Chemical Reactions amd Equations Page 23 3. Change in colour (a) 1 and 2 4. Change in temperature (b) 2 and 3 (a) 1, 2 and 3 (c) 1 and 3 (b) 1, 2 and 4 (d) 1, 2 and 3 (c) 1, 3 and 4 (d) 1, 2, 3 and 4 Sol : www.cbse.site/sc/am207 Sol : www.cbse.site/sc/am204 108. Which of the following are correctly matched? 105. Which of the following are correctly 1. Combination Formation of single matched? 1. Reactant .......... substance which reaction product. undergoes change. 2. Product .......... new substance. 2. Decomposition Break down of 3. Chemical reaction .......... simplest form. (a) 1 and 2 reaction single, entity. (b) 2 and 3 3. Thermal Heat is used. (c) 1 and 3 decomposition (d) 1, 2 and 3 4. Displacement Based on reactivity Sol : www.cbse.site/sc/am205 reaction series. 106. Which of the following is/are correct for a (a) 1, 2 and 3 balanced chemical equation? (b) 1, 2 and 4 1. It is based on law of conservation of (c) 1, 3 and 4 mass. (d) 1, 2, 3 and 4 2. The physical states makes the chemical reaction less informative. Sol : www.cbse.site/sc/am208 (a) Only 1 109. Which of the statements about the reaction (b) Only 2 below are correct? (c) Both 1 and 2 2PbO (s) + C (s) $ 2Pb (s) + CO2(g) (d) Neither 1 nor 2 1. Lead is getting reduced. 2. Carbon dioxide is getting oxidised. Sol : www.cbse.site/sc/am206 3. Carbon is getting oxidised. 4. Lead oxide is getting reduced. 107. Which of the following are correctly (a) 1 and 2 matched? (b) 1 and 3 (c) 1, 2 and 3 Symbol State (d) All the above 1. Aq soluble in alcohol 2. l liquid Sol : www.cbse.site/sc/am209 3. s solid 110. When hydrogen sulphide gas is passed through a blue solution of copper sulphate, To Purchase Hard Book of From Amazon Click Here. For More Details Whatsapp at 8905629969

Page 24 For Answer and Explanation Question Click the Link in Pink Color. Chap 2 Chemical Reactions amd Equations a black precipitate of copper sulphide is A. obtained and the sulphuric acid so formed (d) A colourless gas liberated in test tube remains in the solution. The reaction is an example of- B. (a) a combination reaction Sol : www.cbse.site/sc/am213 (b) a displacement reaction (c) a decomposition reaction 114. Whenthegasessulphurdioxideandhydrogen (d) a double decomposition reaction sulphide mix in the presence of water, the reaction is SO2 + 2H2S \" 2H2O + 3S. Sol : www.cbse.site/sc/am210 Here hydrogen sulphide is acting as: (a) an oxidising agent 111. What happens when copper rod is dipped (b) a reducing agent in iron sulphate solution? (c) a dehydrating agent (a) Copper displaces iron (d) a catalyst (b) Blue colour of copper sulphate solution Sol : www.cbse.site/sc/am214 is obtained (c) No reaction takes place 115. CuO + H2 \" H2O + Cu, reaction is an (d) Reaction is exothermic example of: (a) redox reaction Sol : www.cbse.site/sc/am211 (b) synthesis reaction (c) neutralisation 112. A student added dilute HCl to a test tube (d) analysis reaction containing zinc granules and made following Sol : www.cbse.site/sc/am215 observations : (a) the zinc surface became dull and black 116. Fe2O3 + 2Al \" Al2O3 + 2Fe (b) a gas evolved which burnt with a pop The above reaction is an example of a- sound (a) combination reaction (c) the solution remained colourless (b) double displacement reaction (d) the solution becomes green in colour (c) decomposition reaction (d) displacement reaction Sol : www.cbse.site/sc/am212 Sol : www.cbse.site/sc/am216 113. A dilute solution of sodium carbonate was 117. When Ca (NO3)2 is heated, it gives CaO, added to two test tubes - one containing NO2(g) and O2(g). The correct number dil HCl (A) and the other containing dilute of moles of Ca (NO3)2, CaO, NO2(g) and NaOH(B). Which of the following was the O2(g) are present in the reaction are correct observation? respectively (a) A brown coloured gas liberated in test (a) 1, 2, 4, 1 tube A. (b) 2, 2, 4, 1 (b) A brown coloured gas liberated in test tube B. (c) A colourless gas liberated in test tube To Purchase Hard Book of From Amazon Click Here. For More Details Whatsapp at 8905629969

This PDF is review version of hard book available on Amazon. In hard book full explanation are given with question. Chap 2 Chemical Reactions amd Equations Page 25 (c) 2, 1, 3, 2 of money is spent to replace damaged iron. (d) 2, 2, 2, 1 (a) Both Assertion and Reason are True Sol : www.cbse.site/sc/am217 and Reason is the correct explanation 118. Which of the following reaction is of the Assertion. characterised by the yellow colour of (b) Both Assertion and Reason are product? True but Reason is not the Correct (a) 2Pb3O4 T 6PbO (s) + O2(g) explanation of the Assertion. (b) Zn (s) + H2SO4 $ ZnSO4 + H2 (c) Assertion is True but the Reason is (c) Na2CO3 + H2SO4 $ Na2SO4 + H2O False. +CO2 (d) Both Assertion and Reason are False. (d) 2KClO3 T 2KCl + 3O2(g) Sol : www.cbse.site/sc/am218 Sol : www.cbse.site/sc/am221 119. Which one of the following involve a 122. Assertion : Changing of colour of copper chemical reaction? from reddish brown to black is an example (a) Heating magnesium wire in the of reduction. presence of air at high temperature Reason : Hydrogen is removed. (b) Evaporation of water (a) Both Assertion and Reason are True (c) Storing on nitrogen gas under pressure and Reason is the correct explanation (d) Keeping petrol in a China dish in of the Assertion. open (b) Both Assertion and Reason are Sol : www.cbse.site/sc/am219 True but Reason is not the Correct explanation of the Assertion. (c) Assertion is True but the Reason is False. (d) Both Assertion and Reason are False. Sol : www.cbse.site/sc/am222 120. Ethane (C2H6) on complete combustion 123. Assertion : When iron nail is dipped in gave CO2 and water. It shows that the copper sulphate solution, the iron nail results are in accordance with the law of becomes brownish in colour and the blue conservation of mass. Then, the coefficient colour of copper solution fade. of oxygen is equal to Reason : Equation representing this change (a) 7/2 is (b) 3/2 Cu + FeSO4 $ CuSO4 + Fe (c) 5/2 (a) Both Assertion and Reason are True (d) 9/2 and Reason is the correct explanation of the Assertion. Sol : www.cbse.site/sc/am220 (b) Both Assertion and Reason are 121. Assertion : Corrosion of iron is a serious True but Reason is not the Correct problem. explanation of the Assertion. Reason : Every year an enormous amount (c) Assertion is True but the Reason is To Purchase Hard Book of From Amazon Click Here. For More Details Whatsapp at 8905629969

Page 26 For Answer and Explanation Question Click the Link in Pink Color. Chap 2 Chemical Reactions amd Equations False. of the Assertion. (d) Both Assertion and Reason are False. (b) Both Assertion and Reason are Sol : www.cbse.site/sc/am223 True but Reason is not the Correct explanation of the Assertion. 124. Assertion : Silver chloride turns grey is (c) Assertion is True but the Reason is sunlight. False. Reason : Silver is one of the least reactive (d) Both Assertion and Reason are False. metals. (a) Both Assertion and Reason are True Sol : www.cbse.site/sc/am226 and Reason is the correct explanation of the Assertion. 127. Assertion : Chemical equations can be (b) Both Assertion and Reason are made more informative. True but Reason is not the Correct Reason : We can write physical state of explanation of the Assertion. reactants and products, temperature and (c) Assertion is True but the Reason is pressure, name of catalyst used etc. False. (a) Both Assertion and Reason are True (d) Both Assertion and Reason are False. and Reason is the correct explanation of the Assertion. Sol : www.cbse.site/sc/am224 (b) Both Assertion and Reason are True but Reason is not the Correct 125. Assertion : When water is added to calcium explanation of the Assertion. oxide, a large amount of heat is produced. (c) Assertion is True but the Reason is Reason : It is an endothermic reaction. False. (a) Both Assertion and Reason are True (d) Both Assertion and Reason are False. and Reason is the correct explanation of the Assertion. Sol : www.cbse.site/sc/am227 (b) Both Assertion and Reason are True but Reason is not the Correct 128. Assertion : Equation explanation of the Assertion. C (s) + O2(g) $ CO2(g) is an example of (c) Assertion is True but the Reason is combination reaction. False. Reason : In the given above equation, (d) Both Assertion and Reason are False. carbon and oxygen react to give carbon dioxide. Sol : www.cbse.site/sc/am225 (a) Both Assertion and Reason are True and Reason is the correct explanation 126. Assertion : A chemical equation should be of the Assertion. balanced. (b) Both Assertion and Reason are Reason : Number of atoms of each element True but Reason is not the Correct should be same on reactants as well as explanation of the Assertion. products side. (c) Assertion is True but the Reason is (a) Both Assertion and Reason are True False. and Reason is the correct explanation (d) Both Assertion and Reason are False. Sol : www.cbse.site/sc/am228 To Purchase Hard Book of From Amazon Click Here. For More Details Whatsapp at 8905629969

This PDF is review version of hard book available on Amazon. In hard book full explanation are given with question. Chap 2 Chemical Reactions amd Equations Page 27 129. Assertion : Chips manufacturers usually Sol : www.cbse.site/sc/am231 flush bags of chips with oxygen gas. Reason : It adds taste to chips. 132. Assertion : Decomposition reactions are (a) Both Assertion and Reason are True similar to combination reactions. and Reason is the correct explanation Reason : Both reactions need a catalyst of the Assertion. to occur. (b) Both Assertion and Reason are (a) Both Assertion and Reason are True True but Reason is not the Correct and Reason is the correct explanation explanation of the Assertion. of the Assertion. (c) Assertion is True but the Reason is (b) Both Assertion and Reason are False. True but Reason is not the Correct (d) Both Assertion and Reason are False. explanation of the Assertion. (c) Assertion is True but the Reason is Sol : www.cbse.site/sc/am229 False. (d) Both Assertion and Reason are False. 130. Assertion : Precipitation reactions produce insoluble salts. Sol : www.cbse.site/sc/am232 Reason : Precipitation reaction is a double decomposition reaction. 133. Assertion : Corrosion of iron is commonly (a) Both Assertion and Reason are True known as rusting. and Reason is the correct explanation Reason : Corrosion of iron occurs in of the Assertion. presence of water and air. (b) Both Assertion and Reason are (a) Both Assertion and Reason are True True but Reason is not the Correct and Reason is the correct explanation explanation of the Assertion. of the Assertion. (c) Assertion is True but the Reason is (b) Both Assertion and Reason are False. True but Reason is not the Correct (d) Both Assertion and Reason are False. explanation of the Assertion. (c) Assertion is True but the Reason is Sol : www.cbse.site/sc/am230 False. (d) Both Assertion and Reason are False. 131. Assertion : During digestion, carbohydrates are broken down to form glucose. Sol : www.cbse.site/sc/am233 Reason : Glucose is necessary for breathing. (a) Both Assertion and Reason are True 134. Assertion : A reducing agent is a substance and Reason is the correct explanation which can either accept electron. of the Assertion. Reason : A substance which helps in (b) Both Assertion and Reason are oxidation is known as reducing agent. True but Reason is not the Correct (a) Both Assertion and Reason are True explanation of the Assertion. and Reason is the correct explanation (c) Assertion is True but the Reason is of the Assertion. False. (b) Both Assertion and Reason are (d) Both Assertion and Reason are False. To Purchase Hard Book of From Amazon Click Here. For More Details Whatsapp at 8905629969

Page 28 For Answer and Explanation Question Click the Link in Pink Color. Chap 2 Chemical Reactions amd Equations True but Reason is not the Correct faster at higher temperatures. explanation of the Assertion. Reason : At higher temperatures, molecular (c) Assertion is True but the Reason is motion becomes more rapid. False. (a) Both Assertion and Reason are True (d) Assertion (A) is false but reason (R) is true. and Reason is the correct explanation of the Assertion. Sol : www.cbse.site/sc/am234 (b) Both Assertion and Reason are True but Reason is not the Correct 135. Assertion : The balancing of chemical explanation of the Assertion. equations is based on law of conservation (c) Assertion is True but the Reason is of mass. False. Reason : Total mass of reactants is equal to (d) Both Assertion and Reason are False. total mass of products. (a) Both Assertion and Reason are True Sol : www.cbse.site/sc/am237 and Reason is the correct explanation of the Assertion. 138. Assertion : The following chemical equation, (b) Both Assertion and Reason are 2C6H6 + 7O2 $ 4CO2 + 6H2O True but Reason is not the Correct explanation of the Assertion. is a balanced chemical equation. (c) Assertion is True but the Reason is Reason : In a balanced chemical equation, False. the total number of atoms of each element (d) Both Assertion and Reason are False. may or may not equal on both side of the equation. Sol : www.cbse.site/sc/am235 (a) Both Assertion and Reason are True 136. Assertion : Carbon dioxide turns lime and Reason is the correct explanation water milky. of the Assertion. Reason : Carbon dioxide sullies the water. (b) Both Assertion and Reason are (a) Both Assertion and Reason are True True but Reason is not the Correct and Reason is the correct explanation explanation of the Assertion. of the Assertion. (c) Assertion is True but the Reason is (b) Both Assertion and Reason are False. True but Reason is not the Correct (d) Both Assertion and Reason are False. explanation of the Assertion. (c) Assertion is True but the Reason is Sol : www.cbse.site/sc/am238 False. (d) Both Assertion and Reason are False. 139. Assertion : Fe2O3 + 2Al $ Al2O3 + 2Fe The above chemical equation is an example Sol : www.cbse.site/sc/am236 of displacement reaction. Reason : Aluminium being more reactive 137. Assertion : A chemical reaction becomes than iron, displaces Fe from its oxide. (a) Both Assertion and Reason are True and Reason is the correct explanation of the Assertion. (b) Both Assertion and Reason are To Purchase Hard Book of From Amazon Click Here. For More Details Whatsapp at 8905629969

This PDF is review version of hard book available on Amazon. In hard book full explanation are given with question. Chap 2 Chemical Reactions amd Equations Page 29 True but Reason is not the Correct Sol : www.cbse.site/sc/am241 explanation of the Assertion. (c) Assertion is True but the Reason is

competency BASED QUESTION False. (d) Both Assertion and Reason are False. Sol : www.cbse.site/sc/am239 140. Assertion : Photosynthesis is considered as 142. Sunita takes about 2 g ferrous sulphate an endothermic reaction. crystals in dry boiling tube and heat the Reason : Energy gets released in the process boiling tube over the flame of a burner or of photosynthesis. spirit lamp as shown in the figure. (a) Both Assertion and Reason are True and Reason is the correct explanation of the Assertion. (b) Both Assertion and Reason are True but Reason is not the Correct explanation of the Assertion. (c) Assertion is True but the Reason is False. (d) Both Assertion and Reason are False. Sol : www.cbse.site/sc/am240 141. Assertion : In the following chemical The colour of crystals after heating is: equation, (a) Black CuO (s) + Zn (s) $ ZnO (s) + Cu (s) (b) Brown Zinc is getting oxidised and copper oxide is (c) Green getting reduced. (d) Orange Reason : The process in which oxygen is added to a substance is called oxidation Sol : www.cbse.site/sc/am242 whereas the process in which oxygen is removed from a substance is called 143. Three beakers labelled as P,Q and R each reduction. containing 25 ml of water were taken. A (a) Both Assertion and Reason are True small amount of NaOH, anhydrous CuSO4 and Reason is the correct explanation and NaCl were added to the beakers P,Q of the Assertion. and R respectively. It was observed that there was an increase in the temperature (b) Both Assertion and Reason are of the solutions contained in beakers P True but Reason is not the Correct and Q , whereas in case of breaker R, the explanation of the Assertion. temperature of the solution falls. Which one of the following statements(s) is (are) (c) Assertion is True but the Reason is False. (d) Both Assertion and Reason are False. To Purchase Hard Book of From Amazon Click Here. For More Details Whatsapp at 8905629969

Page 30 For Answer and Explanation Question Click the Link in Pink Color. Chap 2 Chemical Reactions amd Equations correct? 1. In beakers P and Q , exothermic process Which of the following product is formed in has occurred. the above process? (a) Lead oxide 2. In beakers P and Q , endothermic process (b) Lead carbonate has occurred. (c) Lead sulphide (d) Lead sulphide 3. In beaker R, exothermic process has Sol : www.cbse.site/sc/am244 occurred. 145. A experimental arrangement of formation 4. In beaker R, endothermic process has of gas is shown in the figure: occurred. (a) Only 1 (b) Only 2 (c) 1 and 4 (d) 2 and 3 Sol : www.cbse.site/sc/am243 144. Ramesh is science teacher in Kendriya Vidyalya. He asked Sunita to perform following activity steps with lead nitrate powder. • Take about 2 g lead nitrate powder in a boiling tube. • Hold the boiling tube with a pair of tongs and heat it over a flame as shown in figure. Which gas is present in tube A? (a) Oxygen To Purchase Hard Book of From Amazon Click Here. For More Details Whatsapp at 8905629969

This PDF is review version of hard book available on Amazon. In hard book full explanation are given with question. Chap 2 Chemical Reactions amd Equations Page 31 (b) Hydrogen solution for one week. (c) Helium (d) Nitrogen Sol : www.cbse.site/sc/am245 146. The silver chloride placed under the sunlight as shown in the figure: The colour of silver chloride after some After one week, the colour of sulphate time is: solution is: (a) Black (a) Green (b) Green (b) Yellow (c) Gray (c) Red (d) Yellow (d) Colourless Sol : www.cbse.site/sc/am247 Sol : www.cbse.site/sc/am246 148. Sodium sulphate and barium chloride mixed together as shown in the figure. 147. One day Mohan was performing an experiment in the laboratory. By mistake he leaves the iron mail in the copper sulphate Which colour substance is formed in the test tube? (a) White (b) Black (c) Green (d) Yellow To Purchase Hard Book of From Amazon Click Here. For More Details Whatsapp at 8905629969

Page 32 For Answer and Explanation Question Click the Link in Pink Color. Chap 2 Chemical Reactions amd Equations Sol : www.cbse.site/sc/am248 149. A small amount of copper power is heated as shown in the figure. Which reaction shows the above process? Which of the following reaction is take (a) 2Cu + O2 $ 2CuO place here? (b) CuO + H2 $ Cu + H2O (a) 2Mg + O2 $ 2MgO (c) Cu + O2 $ 2CuO (b) 2Mg + H2 $ 2MgH (d) CuO + N2 $ Cu + N2O (c) 2Mg + N2 $ 2MgN (d) 2Mg + He2 $ 2MgHe Sol : www.cbse.site/sc/am249 Sol : www.cbse.site/sc/am251 150. The reason of colour changing of silver anklet after few day is: 152. The science teacher said to Ram to (a) formation of silver sulphide. perform a experiment with lead nitrate and (b) formation of silver nitrate. potassium iodide. He done the following (c) formation of silver chloride. steps under the observation of our teacher. (d) formation of silver bromide. 1. Take lead nitrate solution in a beaker. 2. Take potassium iodide solution in a test Sol : www.cbse.site/sc/am250 tube. (Both solutions are colourless). 3. Add potassium iodide solution slowly to 151. The science teacher ordered to Mohit done the lead nitrate solution. the following practical step with magnesium Which chemical reaction take place here? ribbon: (a) Pb (NO3)2 + 2KI $ PbI2 + 2KNO3 1. Clean a magnesium ribbon about 3-4 cm (b) Pb (NO3)2 + KI $ PbI2 + 2NO3 long by rubbing it with sandpaper. (c) Pb (NO3)2 + I $ PbI + 2K 2. Hold it with a pair of tongs. Burn it (d) Pb (NO3) + 2KI $ 2PbI2 + 2KNO3 using a spirit lamp or burner and collect the ash so formed in a watch-glass as Sol : www.cbse.site/sc/am252 shown in Figure. Burn the magnesium ribbon keeping it away as far as possible 153. One day Sunita went in the science lab and from your eyes. the take a few zinc granules in a conical flask or a test tube and add dilute hydrochloric To Purchase Hard Book of From Amazon Click Here. For More Details Whatsapp at 8905629969

This PDF is review version of hard book available on Amazon. In hard book full explanation are given with question. Chap 2 Chemical Reactions amd Equations Page 33 acid or sulphuric acid in it. 155. Which change is observed by Ganesh after touching the beaker? (a) Change in temperature (b) Change in the shape of beaker (c) Change in the colour of water (d) None of these Sol : www.cbse.site/sc/am254 Which change is seen by Sunita in the

Direction For Questions (156-160) above experimental process? (a) Change in temperature In chemistry lab, a student took HCl in a (b) Change in colour beaker and was placed on a white paper with (c) Evolution of gas cross mark. When seen through the beaker (d) Change in state the mark as shown in the figure was visible. On adding some sodium thiosulphate in Sol : www.cbse.site/sc/am253 the beaker the cross marked disappeared. When seen through the beaker. The student

Direction For Questions (154-155) observed some reaction as the products Teacher asked Ganesh to do following formed were different than the reactants. experiment. Both the reactants were transparent. • Take a small amount of calcium oxide or quick lime in a beaker. • Slowly add water to this. • Touch the beaker as shown in Figure. 154. Which of the following reaction take place 156. Which of the following reaction is of similar here? type as observed in the given set up. (a) CaO + H2O $ Ca (OH)2 + Heat (a) CaO (s) + H2O (l) \" Ca (OH)2(aq) (b) CaO + H2O $ Ca (OH)2 − Heat (c) CaO + H2O $ CaH2 + Heat (b) 2FeSO4(s) O Fe2O3(s) + SO2(g) (d) CaO + H2O $ Ca (OH)2 Sol : www.cbse.site/sc/am254 + SO 3 (g) (c) Fe (s) + CuSO4(aq) \" FeSO4(aq) +Cu (s) (d) Na2SO4(aq) + BaCl2(aq) \" BaSO4(s) +2NaCl (aq) To Purchase Hard Book of From Amazon Click Here. For More Details Whatsapp at 8905629969

Page 34 For Answer and Explanation Question Click the Link in Pink Color. Chap 2 Chemical Reactions amd Equations Sol : www.cbse.site/sc/am255 (c) SO3 (d) O2 157. Name the resultant insoluble substance formed in the flask. Sol : www.cbse.site/sc/am255 (a) Sulphur (b) Sodium sulphide

Direction For Questions (161-162) (c) Sodium sulphate (d) Sodium carbonate A reaction in which a single reactant breaks Sol : www.cbse.site/sc/am255 down to form two or more products is known as decomposition reaction. Decomposition 158. Which of the following reaction is done in reaction is just the opposite of combination the above arrangement? reaction. (a) Double displacement reaction The decomposition reaction takes place (b) Displacement reaction only when the energy in the form of heat, (c) Precipitation reaction electricity or light is supplied. (d) Redox reaction Oxygen is prepared by catalytic Sol : www.cbse.site/sc/am255 decomposition of potassium chlorate ^KClO3h. Decomposition of potassium chlorate gives potassium chloride (KCl) and oxygen ^O2h. The following reaction takes place : KClO3(s) $ KCl (s) + O2(g) 159. Why did the cross mark disappear? 161. How many moles of KClO3 are required to (a) The solution so formed has ability produce 2.4 moles of O2? to absorb black colour hence black (a) 1.6 coloured cross is not seen. (b) 2.9 (b) The resultant solution has high (c) 1.9 viscosity due to which it refracts the (d) 2.4 light to other angle. Sol : www.cbse.site/sc/am256 (c) The resultant solution is dark coloured which does not allow the light to pass 162. Which of following element is reduced in through it. the given reaction? (d) The insoluble precipitate that is (a) Oxygen formed in the flask does not allow (b) Potassium the light to pass through it to see the (c) Chlorine cross mark. (d) None of these Sol : www.cbse.site/sc/am256 Sol : www.cbse.site/sc/am255

Direction For Questions (163-164) 160. Which of the following gas is formed in Corrosion is the phenomenon of above reaction? (a) Cl2 (b) SO2 To Purchase Hard Book of From Amazon Click Here. For More Details Whatsapp at 8905629969

This PDF is review version of hard book available on Amazon. In hard book full explanation are given with question. Chap 2 Chemical Reactions amd Equations Page 35 deterioration of surface of metal in presence Any process which involves addition of air and moisture. It is a natural process of oxygen (or non-metallic element) or and in the presence of a moist atmosphere, removal of hydrogen (or metallic element) chemically active metals get corroded. This or loss of electron(s) from an atom or an ion is oxidation reaction. Rusting is the process is called oxidation reaction. The substance where iron corrodes due to exposure to which can bring about oxidation of other the atmosphere. The main circumstance substances is called oxidising agent. of corrosion occurs with iron because it Any process which involves addition of is a structural material in construction, hydrogen (or metallic element) or removal bridges, buildings, rail transport, ships, etc. of oxygen (or non-metallic element) or gain Aluminium is also an important structural of electrons(s) by atom an or ion is called metal, but even aluminium undergoes reduction reaction. oxidation reactions. However, aluminium The substance which can bring about doesn’t corrode or oxidise as rapidly as its reduction of other substances is called a reactivity suggests. An alloy of aluminium reducing agent. or any other metal like magnesium can Oxidation and reduction always take place make aluminium stronger and harder. together and these type of reactions are Copper (Cu) corrodes and forms a basic known as redox reactions. Some of the green carbonate and lead corrodes to form examples of redox reactions are given a white lead oxide or carbonate. below: a. Pb3O4 + 8HCl \" 3PbCl2 + Cl2 + 4H2O 163. Which two metals do not corrode easily? (a) Gold b. 2Mg + O2 $ 2MgO (b) Copper c. CuSO4 + Zn $ Cu + ZnSO4 (c) Platinum d. V2O5 + 5Ca $ 2V + 5CaO (d) Both (a) and (b) e. 3Fe + 4H2O $ Fe3O4 + 4H2 Sol : www.cbse.site/sc/am257 f. CuO + H2 $ Cu + H2O 164. Select the incorrect statement from the 165. Which of the following is the example of following options : oxidation reaction from your everyday life? (a) Replace of corroded equipment is time (a) Corrosion consuming. (b) Rancidity (b) Corrosion is a type of oxidation (c) Electricity in batteries reaction. (d) Both (a) and (b) (c) Corrosion increases the electrical conductivity of metals. Sol : www.cbse.site/sc/am258 (d) Corrosion causes leakage of toxic liquid or gases. 166. The oxidising agent in the reaction c and f are: Sol : www.cbse.site/sc/am257 (a) CuSO4 and CuO (b) CuO and CuSO4

Direction For Questions (165-168) (c) Zn and CuO (d) CuO and Zn To Purchase Hard Book of From Amazon Click Here. For More Details Whatsapp at 8905629969

Page 36 For Answer and Explanation Question Click the Link in Pink Color. Chap 2 Chemical Reactions amd Equations Sol : www.cbse.site/sc/am258 167. Which of the following is an oxidising agent? (a) LiAlH4 (b) Alkaline KMnO4 (c) Acidified K2Cr2O7 (d) Both (b) and (c) Sol : www.cbse.site/sc/am258 168. A reaction in which a single reactant breaks down to form two or more products is known as decomposition reaction. Decomposition reaction is just the opposite of combination reaction. The decomposition reaction takes Redox reactions play a vital role in our place only when the energy in the form of daily life. Generation of electricity in heat, electricity or light is supplied. batteries, production of heat energy by Example: Ferrous sulphate crystals on burning chemical substances, extraction of heating in a dry boiling tube gives the metals, manufacture of a number of useful following reaction: products are common examples of redox reactions. 2FeSO4(s) Heat Fe2O3(s) + SO2(g) + SO3(g) Which of the following gas has a smell of burning sulphur? 169. Which of the following are the reducing (a) Sulphur oxide agent in (a) and (c)? (b) Sulphur dioxide (a) H2, Zn (c) Sulphur chloride (b) Zn, H2 (d) None of these (c) Cu, H2 Sol : www.cbse.site/sc/am259 (d) H2, Cu Sol : www.cbse.site/sc/am260

Direction For Questions (169-171) 170. Which of the following is not a example of redox reaction? Chemical reactions where oxidation and (a) CO2 + H2 \" CO + H2O reduction both take place simultaneously (b) Zn + CuSO4 \" Cu + ZnSO4 are called redox reactions. In the word, (c) MnO2 + 4HCl \" MnCl2 + Cl2 + 2H2O ‘REDOX’ ‘RED’ stands for reduction and (d) HCl + NaOH \" NaCl + H2O ‘OX’ stands for oxidation. Examples: Sol : www.cbse.site/sc/am260 To Purchase Hard Book of From Amazon Click Here. For More Details Whatsapp at 8905629969

This PDF is review version of hard book available on Amazon. In hard book full explanation are given with question. Chap 2 Chemical Reactions amd Equations Page 37 171. The other name of displacement reaction is: (a) Decomposition reaction (b) Combination reaction (c) Displacement reaction (d) None of these Sol : www.cbse.site/sc/am260 172. Magnesium ribbon burns in air with a 2Mg (s) + O2(g) $ 2MgO (s) dazzling white flame. This is due to the formation of a white solid. This white solid Which of the following is not a combination dissolves in water and gives a solution reaction? which turns red litmus blue. (a) NH3 + HCl $ NH4Cl Which type of reaction is performed in (b) 2NO + O2 $ 2NO2 above process? (c) 2SO2 + O2 $ 2SO3 (a) Combination reaction (d) Cu2O + H2 $ Cu + H2O (b) Decomposition reaction Sol : www.cbse.site/sc/am262 (c) Redox reaction (d) Oxidation reaction Sol : www.cbse.site/sc/am261 173. A reaction in which two or more reactants 174. A balanced chemical equation is one which combine to form a single product is called contains an equal number of atoms of each combination reaction. In combination reactions following three cases are observed: element on both the sides of the equation. Combination of two elements: Two elements combine to form a new compound. Some An unbalanced chemical equation is one in examples are: Combination of hydrogen and chlorine: which the number of atoms of the elements H2(g) + Cl2(g) Sunlight 2HCl (g) on the two sides of the equation is not the Formation of iron sulphide: Fe (s) + S (s) Heat FeS (s) same. An unbalanced chemical equation is Burning of coal: C (s) + O2(g) $ CO2(g) also called skeletal chemical equation. Combustion of hydrogen: Kl + Cl2 \" KCl + l2 (Unbalanced chemical 2H2(g) + O2(g) $ 2H2O (I) equation). 2Kl + Cl2 \" 2KCl + l2 (Balanced chemical equation). To Purchase Hard Book of From Amazon Click Here. For More Details Whatsapp at 8905629969

Page 38 For Answer and Explanation Question Click the Link in Pink Color. Chap 2 Chemical Reactions amd Equations C3H8 + 5O2 $ 3CO2 + 4H2O Fe (s) + H2O (g) $ Fe3O4(s) + H2(g) The balance chemical equation of above skeletal chemical equation is: (a) 2Fe (s) + 4H2O (g) \" Fe3O4(s) + 4H2(g) (b) 3Fe (s) + 4H2O (g) \" Fe3O4(s) + 4H2(g) (c) 5Fe (s) + 4H2O (g) \" Fe3O4(s) + H2(g) (d) 3Fe (s) + 4H2O (g) \" Fe2O4(s) + H2(g) Sol : www.cbse.site/sc/am263

****** Don’t Take Printout of This File because this is not useful. You can purchase hard book from Amazon. Hard book includes explanation of all MCQs in print form.

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