Chapter-wise MCQ Questions

Looking for a reliable source for MCQ - Multiple Choice Questions of Chemical Reactions and Equations in Class 10 Science? Look no further. Our experts have carefully curated all the MCQs, accompanied by answers.

If you need additional preparatory materials like NCERT Solutions or CBSE Sample Papers, count on us. Access Chapter-wise MCQ Questions with Answers of Class 10 Science, available for free in PDF format.

Question-1. Give the ratio in which hydrogen and oxygen are present in water by volume

  1. 1:2
  2. 1:1
  3. 2:1
  4. 1:8
Answer-1

Question-2. Which of the following stands for a double displacement reaction?

  1. 2H2 + O2 → 2H2O
  2. 2Mg + O2 → 2MgO
  3. AgNO3 + NaCl → AgCl? + NaNO3
  4. H2 + Cl2 → 2HCl
Answer-2

Question-3. Which of the following reactions is not balanced?

  1. 2NaHCO3 → Na2CO3 + H2O + CO2
  2. 2C4H10 + 12O2 → 5CO2 + 10H2O
  3. 2Al + 6H2O → 2Al(OH)3 + 3H2
  4. 4NH3 + 5O2 → 4NO + 6H2O
Answer-3

Question-4. The equation Cu + xHNO3 → Cu(NO3)2 + yNO2 + 2H2O The values of x and y are :

  1. 3 and 5
  2. 8 and 6
  3. 4 and 2
  4. 7 and 1
Answer-4

Question-5. Which of the following statements is/are correct ?

  1. A chemical equation tells us about the substances involved in a reaction
  2. A chemical equation informs us about the symbols and formulae of the substances involved in a reaction.
  3. A chemical equation tells us about the atoms or molecules of the reactants and products involved in a reaction.
  4. All the above
Answer-5

Question-6. The reaction in which two compounds exchange their ions to form two new compounds is -

  1. a displacement reaction
  2. a decomposition reaction
  3. an isomerization reaction
  4. a double displacement reaction
Answer-6

Question-7. We store silver chloride in a dark coloured bottle because it is

  1. a white solid
  2. undergoes redoc reaction
  3. to avoid action by sunlight
  4. none of the above
Answer-7

Question-8. Rancidity can be prevented by

  1. adding antioxidants
  2. packaging oily food in nitrogen gas
  3. both A and B
  4. none of these
Answer-8

Question-9. Oxidation is a process which involves

  1. addition of oxygen
  2. addition of hydrogen
  3. removal of oxygen
  4. removal of hydrogen
Answer-9

Question-10. When Ag is exposed to air it gets a black coating of

  1. AgNO3
  2. Ag2S
  3. Ag2O
  4. Ag2CO3
Answer-10

Question-11. Which of the following is the fastest reaction?

  1. aluminium foil + NaOH + heat
  2. aluminium foil + NaOH
  3. aluminium powder + NaOH
  4. all the above
Answer-11

Question-12. In the equation, NaOH + HNO3 → NaNO3 + H2O nitric acid is acting as

  1. an oxidizing agent
  2. an acid
  3. a nitrating agent
  4. a dehydrating agent
Answer-12

Question-13. The condition produced by aerial oxidation of fats and oils in foods marked by unpleasant smell and taste is called:

  1. antioxidation
  2. reduction
  3. rancidity
  4. corrosion
Answer-13

Question-14. Translate the following statements into chemical equations and then balance it. Barium chloride reacts with aluminium sulphate to give aluminium chloride and a precipitate of barium sulphate.

  1. BaCl2 + Al2(SO4)3 → AlCl3 + BaSO4
  2. 3BaCl2 + Al2(SO4)3 → 2 AlCl3 +3BaSO4
  3. BaCl2 + AlSO4 → AlCl2 + BaSO4
  4. BaCl3 + Al(SO4)3 → AlCl3 + Ba(SO4)3
Answer-14

Question-15. Magnesium ribbon is rubbed before burning because it has a coating of

  1. basic magnesium carbonate
  2. basic magnesium oxide
  3. basic magnesium sulphide
  4. basic magnesium chloride
Answer-15

Question-16. Redox reactions are useful in

  1. bleaching industry
  2. extraction of metals
  3. dying industry
  4. all of these
Answer-16

Question-17. When ferrous sulphate is heated strongly it undergoes decomposition to form ferric oxide as a main product accompanied by a change in colour from

  1. Blue to green.
  2. Green to blue.
  3. Green to brown.
  4. Green to yellow.
Answer-17

Question-18. Which of the following is a combustion reaction?

  1. Boiling of water
  2. Melting of wax
  3. Burning of petrol
  4. None of these
Answer-18

Question-19. Which of the following is not physical change?

  1. Boiling of water to give water vapour
  2. Melting of ice to give water
  3. Dissolution of salt in water
  4. Combustion of Liquefied Petroleum Gas (LPG)
Answer-19

Question-20. Pb(NO3)2 which is colourless, reacts with H2S to give a precipitate of PbS, whose colour is

  1. brown
  2. white
  3. black
  4. green
Answer-20

Question-21. Water breaks into its constituents

  1. by magnetic effect
  2. by light
  3. by heating
  4. by passing electric current
Answer-21

Question-22. Which of the following is a reversible reaction?

  1. CaCO3 + 2HCI ® CaCl2 + CO2+H2O
  2. 2Mg + O2® 2MgO
  3. N2 + 3H2 ® 2NH3
  4. Fe + CuSO4 ® FeSO4 + Cu
Answer-22

Question-23. Which of the following is a displacement reaction ?

  1. CaCO3 → CaO + CO2
  2. CaO + 2HCl → CaCl2 + H2O
  3. Fe + CuSO4 → FeSO4 + Cu
  4. NaOH + HCl → NaCl + H2O
Answer-23

Question-24. Which of the following is not a decomposition reaction ?

  1. CaCO3 → CaO + CO2
  2. 2KClO3 → 2KCl + 3O2
  3. Digestion of food in body
  4. H2 + Cl2 → 2HCl
Answer-24

Question-25. When carbon dioxide is passed through lime water,

  1. calcium hydroxide is formed
  2. white precipitate of CaO is formed
  3. lime water turns milky
  4. colour of lime water disappears
Answer-25

Question-26. Which of the following reactions involves the combination of two elements ?

  1. CaO + CO2 → CaCO3
  2. 4Na + O2 → 2Na2O
  3. SO2 + 1/2 O2 → SO3
  4. NH3 + HCl → NH4Cl
Answer-26

Question-27. Which of the following is a displacement reaction ?

  1. CaO + H2O → Ca(OH)2
  2. MgCO3 → MgO + CO2
  3. 2Na + 2H2O → 2NaOH + H2
  4. H2 + Cl2 → 2HCl
Answer-27

Question-28. Write the balanced reaction of Calcium oxide with water and state what type of reaction is this

  1. CaO + H2O→ CaOH + H2, displacement
  2. CaO + H2O → Ca(OH)2, combination
  3. CaO + H2O→ Ca(OH)2, decomposition
  4. CaO + H2O→ CaOH, combination
Answer-28

Question-29. Which of the following gases can be used for storage

  1. Carbon dioxide or Oxygen
  2. Nitrogen or Oxygen
  3. Carbon dioxide or Helium
  4. Helium or Nitrogen
Answer-29

Question-30. Which of the following gases is used in the storage of fat and oil containing foods for a long time?

  1. Carbondioxide gas
  2. Nitrogen gas
  3. Oxygen gas
  4. Neon gas
Answer-30

Question-31. In a chemical reaction, if one of the product is a gas which burns with a ?pop?, then the gas is

  1. Cl2
  2. O2
  3. H2
  4. CO2
Answer-31

Question-32. The gas which smells like rotten eggs is

  1. CO2
  2. NO2
  3. SO2
  4. H2S
Answer-32

Question-33. A catalyst when added to a chemical reaction changes the

  1. colour of the reactants
  2. course of the reaction
  3. speed of the reaction
  4. physical state of the products
Answer-33

Question-34. The reaction of H2 gas with oxygen gas to form water is an example of

  1. combination reaction
  2. redox reaction
  3. exothermic reaction
  4. all of these reactions
Answer-34

Question-35. Fe2O3 + 2Al → Al2O3 + 2Fe The above reaction is an example of

  1. Combination reaction
  2. Double displacement reaction
  3. Decomposition reaction
  4. Displacement reaction
Answer-35

Question-36. CuSO4 + Zn → Cu + ZnSO4 This reaction is an example of a

  1. Combination reaction.
  2. Double displacement reaction.
  3. Decomposition reaction.
  4. Displacement reaction.
Answer-36

Question-37. Identify the type of reaction in each case. Zinc carbonate(s) ? Zinc oxide(s) + Carbon dioxide(g)Hydrogen(g) + Chlorine(g) → Hydrogen chloride(g)

  1. Combination, Decomposition
  2. Double displacement, Combination
  3. Decomposition, Combination
  4. Displacement, Decomposition
Answer-37

Question-38. It is necessary to balance a chemical equation in order to satisfy the law of

  1. Conservation of motion
  2. Conservation of momentum
  3. Conservation of energy
  4. Conservation of mass
Answer-38

Question-39. Which of the following metal is protected by a layer of its oxide ?

  1. Copper
  2. Silver
  3. Iron
  4. Aluminium
Answer-39

Question-40. The displacement reaction between iron (III) oxide and a metal X is used for welding the rail tracks. Here X is

  1. Copper granules
  2. Magnesium ribbon
  3. Sodium pellets
  4. Aluminium dust
Answer-40

Question-41. Identify the substances that are oxidised and the substances that are reduced in the following reactions. CuO(s) + H2(g)→ Cu(s) + H2O(l)

  1. Cu is oxidised, H2O is reduced
  2. CuO is oxidised, H2O is reduced
  3. H2 is oxidised, CuO is reduced
  4. H2 is oxidised, H2O is reduced
Answer-41

Question-42. The reactian H2 + Cl2 → 2 HCl is a :

  1. Decomposition reaction
  2. Combination reaction
  3. Double displacement reaction
  4. Displacement reaction
Answer-42

Question-43. Which of the following does not involve a chemical reaction?

  1. Digestion of food in our body
  2. Process of respiration
  3. Burning of candle wax when heated
  4. Melting of candle wax on heating
Answer-43

Question-44. In our body the catalyst which helps to break down food is

  1. dil HCI
  2. hormones
  3. NaOH
  4. digestive enzymes
Answer-44

Question-45. The neutralization reaction between an acid and a base is a type of

  1. Double displacement reaction
  2. Displacement reaction
  3. Addition reaction
  4. Decomposition reaction
Answer-45

Question-46. A reaction of hydrogen with oxygen to form water is a

  1. Endothermic reaction
  2. Exothermic reaction
  3. Decomposition reaction
  4. Reaction not feasible
Answer-46

Question-47. What type of reaction is respiration

  1. Exothermic
  2. Endothermic
  3. Reduction reaction
  4. Combination reaction
Answer-47

Question-48. Redox reactions are those where ___ simultaneously

  1. exothermic - endothermic reactions occur
  2. oxidation - reduction occur
  3. reversible - irreversible reactions occur
  4. composition - decomposition reactions occur
Answer-48

Question-49. The respiration process during which glucose undergoes slow combustion by combining with oxygen in the cells of our body to produce energy, is a kind of

  1. Exothermic process
  2. Endothermic process
  3. Reversible process
  4. Physical process
Answer-49

Question-50. Neutralization reaction is an example of :

  1. Exothermic reaction
  2. Endothermic reaction
  3. Oxidation reaction
  4. None of these
Answer-50

Question-51. Name the products formed when iron filings are heated with dilute hydrochloric acid

  1. Fe (III) chloride and water
  2. Fe (II) chloride and water
  3. Fe (II) chloride and hydrogen gas
  4. Fe (III) chloride and hydrogen gas
Answer-51

Question-52. Which of the following is a physical change?

  1. Formation of curd from milk
  2. Ripening of fruits
  3. Getting salt from sea water
  4. Burning of wood
Answer-52

Question-53. A chemical reaction does not involve

  1. Formation of new substances having entirely different properties than that of the reactants
  2. Breaking of old chemical bonds and formation of new chemical bonds
  3. Rearrangement of the atoms of reactants to form new products
  4. Changing of the atoms of on element into those of another element to form new products
Answer-53

Question-54. The formation of gas bubbles in a liquid during a reaction is called

  1. fuzzing
  2. bubbling
  3. deliquidizing
  4. effervescence
Answer-54

Question-55. Silver article turns black when kept in the open for a few days due to formation of

  1. H2S
  2. AgS
  3. AgSO4
  4. Ag2S
Answer-55

Question-56. In the reaction, 2H2S + SO2 → 3S + 2H2O

  1. H2S has been oxidized
  2. SO2 has been oxidized
  3. H2S is the oxidizing agent
  4. SO2 is the reducing agent
Answer-56

Question-57. In a chemical reaction between sulphuric acid and barium chloride solution the white precipitates formed are of

  1. Hydrochloric acid
  2. Barium sulphate
  3. Chlorine
  4. Sulphur
Answer-57

Question-58. Which reactant is reduced in given reaction CuO + H2 → Cu + H2O

  1. Hydrogen
  2. Oxygen
  3. Copper Oxide
  4. none of the above.
Answer-58

Question-59. When dilute hydrochloric acid is added to iron fillings :

  1. Hydrogen gas and ferric chloride and produced
  2. Chlorine gas and ferric hydroxide and produced
  3. No reaction takes place
  4. Iron salt and water are produced
Answer-59

Question-60. What happens when dilute hydrochloric acid is added to iron filling? Tick the correct answer

  1. Hydrogen gas and iron chloride are produced
  2. Chlorine gas and iron hydroxide are produced
  3. No reaction takes place
  4. Iron salt and water are produced
Answer-60

Question-61. Which of the following statement is incorrect ?

  1. In oxidation, oxygen is added to a substance
  2. In reduction, hydrogen is added to a substance
  3. Oxidizing agent is oxidized
  4. Reducing agent is oxidized
Answer-61

Question-62. Solubility of a solute

  1. increases with temperature
  2. decreases with temperature
  3. remains constant
  4. none of these
Answer-62

Question-63. The blue flame in the below image represents the burning of which metal?

  1. Iron
  2. Copper
  3. Sodium
  4. All metal burn to give a blue flame
Answer-63

Question-64. Which of the statements about the reaction below are incorrect? Fe2O3(s) + 3CO(g) →2Fe(s) +3CO2(g)

  1. Iron is getting reduce
  2. Carbon dioxide is getting oxidised)
  3. Carbon monoxide is getting oxidised)
  4. Iron oxide is getting reduced)
Answer-64

Question-65. Reaction in which heat energy is released is called

  1. irreversible
  2. reversible
  3. endothermic
  4. exothermic
Answer-65

Question-66. When green coloured ferrous sulphate crystals are heated, the colour of the crystal changes because

  1. it is decomposed to ferric oxide
  2. it loses water of crystallisation
  3. it forms SO2
  4. it forms SO3
Answer-66

Question-67. The balancing of chemical equations is in accordance with

  1. Law of combining volumes
  2. Law of constant proportions
  3. Law of conservation of mass
  4. Both b and c
Answer-67

Question-68. Symbol ? used while representing some chemical changes stands for -

  1. light
  2. heat
  3. catalyst
  4. pressure
Answer-68

Question-69. Before burning in air, the magnesium ribbon is cleaned by rubbing with a sand paper to

  1. Make the ribbon surface shinier
  2. Remove the layer of magnesium oxide from the ribbon surface
  3. Remove the layer of magnesium carbonate from the ribbon surface
  4. Remove the moisture from the ribbon surface
Answer-69

Question-70. One of the following processes does not involve a chemical reaction. That is

  1. Melting of candle wax when heated
  2. Burning of candle wax when heated
  3. Digestion of food in our stomach
  4. Ripening of banana
Answer-70

Question-71. In the decomposition of NH4CI, the products formed are

  1. N2 + Cl2
  2. NH3 + HCI
  3. H2 + Cl2
  4. N2 + HCI
Answer-71

Question-72. Which of the following is a decomposition reaction ?

  1. NaOH + HCl → NaCl + H2O
  2. NH4CNO → H2NCOONH2
  3. 2KClO3 → 2KCl + 3O2
  4. H2 + I2 → 2HI
Answer-72

Question-73. The gas which has a characteristic pungent smell is

  1. NH3
  2. Cl2
  3. SO2
  4. H2
Answer-73

Question-74. When dilute HCl is added to zinc pieces taken in a test tube

  1. No change takes place
  2. the colour of the solution becomes yellow
  3. A pungent smelling gas gets liberate
  4. small bubbles of H2 gas appear on the surface of zinc pieces
Answer-74

Question-75. When dilute hydrochloric acid is added to zinc pieces taken in a test tube

  1. no change takes place
  2. the color of the solution becomes yellow
  3. a pungent smelling gas gets liberated
  4. small bubbles of hydrogen gas appear on the surface of zinc pieces
Answer-75

Question-76. On immersing an iron nail in CuSO4 solution for a few minutes, you will observe

  1. No reaction takes place
  2. The color of solution fades away
  3. The surface of iron nails acquire a black coating
  4. The color of solution changes to green
Answer-76

Question-77. Which of the following is formed when lead metal reacts with the solution of copper chloride?

  1. No reaction takes place
  2. Copper chlorine
  3. Lead chloride
  4. Copper-lead chloride
Answer-77

Question-78. A substance added to food containing fats and oils is called:

  1. Oxidant
  2. Rancid
  3. Coolant
  4. Antioxidant
Answer-78

Question-79. In a context of redox reactions, the removal of hydrogen from a substance is known as

  1. Oxidation
  2. Dehydration
  3. Reduction
  4. Dehydrogenation
Answer-79

Question-80. Reaction of phosphorus and oxygen is an example of

  1. oxidation
  2. reduction
  3. rancidity
  4. none of these
Answer-80

Question-81. A substance which oxidises itself and reduces other is known as -

  1. oxidising agent
  2. reducing agent
  3. both of these
  4. none of these
Answer-81

Question-82. Plastic bags containing potato chips are filled with an antioxidant, known as

  1. oxygen
  2. nitrogen
  3. hydrogen
  4. carbon monoxide
Answer-82

Question-83. When lead nitrate reacts with potassium iodide, yellow precipitate of

  1. PbI2 is formed
  2. KNO3 is formed
  3. Pb(NO3)2 is formed
  4. PbIO3 is formed
Answer-83

Question-84. Dissolving suger is an example of

  1. Physical change
  2. Chemical change
  3. Redox Reaction
  4. None of these
Answer-84

Question-85. In an electrolytic cell where electrolysis is carried, anode has:

  1. Positive change
  2. Negative charge
  3. Connected to negative terminal of the battery
  4. None of these is correct
Answer-85

Question-86. The chemical reaction between two substances is characterized by a change in colour from Orange to green. These two substances are most likely to be

  1. Potassium dichromate solution and Sulphur dioxide
  2. Potassium permanganate solution and Sulphur dioxide
  3. Potassium permanganate solution and lemon juice
  4. Potassium dichromate solution and carbon dioxide
Answer-86

Question-87. Zn(s) + H2SO4(aq)→ ZnSO4(aq) + H2(g) is an example of :

  1. Precipitation reaction
  2. Endothermic reaction
  3. Evolution of gas
  4. Change in colour
Answer-87

Question-88. A compound used for whitewashing is

  1. Quick lime
  2. Slaked Lime
  3. Blue vitriol
  4. Limestone
Answer-88

Question-89. Rusting of iron involves a chemical reaction which is a combination of

  1. Reduction as well as combination reactions
  2. Oxidation as well as combination reactions
  3. Reduction as well as displacement reactions
  4. Oxidation as well as displacement reactions
Answer-89

Question-90. A substance x is an oxide of an group 2 element is used in cement industry. On treatment with water it forms solution which turns red litmus to blue. Identify X ?

  1. Slaked lime
  2. Limestone
  3. Quicklime
  4. Silver sulphide
Answer-90

Question-91. The gas which turns lime water milky is

  1. SO
  2. CO
  3. CO2
  4. H2S
Answer-91

Question-92. When S02 gas is passed through saturated solution of H2S, which of the following reaction occurs? A

  1. SO2 + 2H2S → 2H20 + 3S
  2. SO2 + 2H2S → H20 + 3S
  3. SO2 + H2S → H2O + S
  4. SO2 + H2O → SO3 + H2
Answer-92

Question-93. During the process of photosynthesis the catalyst is

  1. sunlight
  2. chlorophyll
  3. CO2
  4. glucose
Answer-93

Question-94. Which of the following statements is/are true?

  1. The total mass of the system remains same in a chemical change
  2. A chemical change is permanent and irreversible.
  3. A physical change is temporary and reversible
  4. All of these
Answer-94

Question-95. A student added dilute HCl to a test tube containing zinc granules and made following observations :

  1. the zinc surface became dull and black
  2. a gas evolved which burnt with a pop sound
  3. the solution remained colourless
  4. the solution becomes green in colour
Answer-95

Question-96. In the electrolysis of water, liquid water decomposes into its

  1. two gaseous constituents
  2. one gaseous and one liquid constituent
  3. two liquid constituents
  4. two solid constituents
Answer-96

Question-97. Color of magnesium oxide is

  1. White
  2. Blue
  3. Grey
  4. Pink
Answer-97

Question-98. Which one of the following reaction will not take place ?

  1. Zn + FeSO4 → ZnSO4 + Fe
  2. 2 Al + 3 MgSO4 → Al2(SO4)3 + 3 Mg
  3. Fe + NiSO4 → FeSO4 + Ni
  4. Cu + 2 AgNO3 → Cu(NO3)2 + 2 Ag
Answer-98

Question-99. Which of the statements about the following reactions is correct? ZnO + CO→Zn + CO2

  1. ZnO is being oxidized
  2. CO is being reduced
  3. CO2 is being oxidized
  4. ZnO is being reduced
Answer-99



Tags:

Multiple Choice Questions and Answers on Chemical Reactions and Equations
Chemical Reactions and Equations Multiple Choice Questions and Answers
Chemical Reactions and Equations Trivia Quiz
Chemical Reactions and Equations Question and Answer PDF Online