Multiple-Choice Questions
(QUESTION BANK)
Chapter 1: CHEMICAL REACTIONS AND EQUATIONS
1. What are the substances that take part in a chemical reaction called?
a. Reactants b. Products
c. Catalysts d. Activators
2. What are the reactions which occur with the absorption of energy called?
a. Exothermic reactions b. Endothermic reactions
c. Redox reactions d. Oxidation reactions
3. Magnesium ribbon burns in air to form
a. magnesium hydroxide. b. magnesium oxide.
c. magnesium carbonate. d. magnesium sulphate.
4. In which type of chemical reactions two or more reactants combine to form a single product?
a. Combination reactions b. Decomposition reactions
c. Displacement reactions d. Double displacement reactions
5. The following chemical equation
N2 + 3H2
→ 2NH3
is an
example of reaction.
a. combination b. decomposition
c. displacement d. double displacement
6. Which of the following equations can be regarded as a general chemical equation for combination reactions?
a. A + B
→ AB b. AB
→ A+B
c. AB + C
→ AC + B d. AB + CD
→ AC + BD
7. What are the chemical reactions in which a single reactant breaks down to give two or more products called?
a. Redox reactions b. Decomposition reactions
c. Displacement reactions d. Double displacement reactions
8. Which of the following chemical equations is an example of decomposition reaction?
a. 2Mg + O2
→ 2MgO b. 2H2 + O2
→ 2H2O
heat
c. CaCO3
→ CaO + CO2 d. Fe + CuSO4
→ FeSO4 + Cu
9. The following equation can be regarded as the general chemical equation for reactions.
AB
→ A+B
Multiple-Choice Questions
a. combination b. decomposition
c. displacement d. double displacement
10. reactions are the opposite of combination reactions.
a. Decomposition b. Displacement
c. Double displacement d. Redox
11. In a thermal decomposition reaction, the decomposition is brought about by
a. heat. b. sunlight.
1
, c. UV light. d. electricity.
12. Decomposition of a chemical compound by the action of light is known as
a. hydrolysis. b. photolysis.
c. electrolysis. d. cytolysis.
13. Which of the following chemical reactions is used in black and white photography?
heat heat
a. CaCO3
→ CaO + CO2 b. 2FeSO4
→ Fe2O3 + SO2 + SO3
sunlight electricity
c. 2AgBr
→ 2Ag + Br2 d. 2H2O → 2H2 + O2
14. When silver chloride is left open in sunlight, it turns grey after some time due to the
a. formation of silver oxide and chlorine.
b. reaction of silver chloride with oxygen present in the air.
c. reaction of silver chloride with moisture present in the air.
d. decomposition of silver chloride into silver and chlorine by light.
15. A chemical equation is balanced to satisfy the
a. law of conservation of mass. b. law of constant proportions.
c. law of multiple proportions. d. law of combining volumes.
16. When calcium carbonate is heated, the gas formed is allowed to pass through freshly-prepared lime water. What
change will be observed in the lime water?
a. The lime water will turn milky. b. The lime water will turn black.
c. A brown ring will be formed in the lime water. d. No change will be observed.
17. Name the chemical reaction in which a more reactive element displaces a less reactive element from the latter’s
salt solution.
a. Combination reaction b. Decomposition reaction
c. Displacement reaction d. Double displacement reaction
18. Which of the following observations will be made when a copper coin is placed in a test tube containing ferrous
sulphate solution?
a. The ferrous sulphate solution will turn blue and a grey substance will be deposited on the copper coin.
b. The ferrous sulphate solution will turn colourless and a grey substance will be deposited on the copper coin.
c. The ferrous sulphate solution will turn colourless and a reddish–brown substance will be deposited on the
copper coin.
d. No change will occur.
19. Which of the following equations can be regarded as a general chemical equation for displacement reactions?
a. A + B
→ AB b. AB
→ A+B
c. AB + C
→ AC + B d. AB + CD
→ AC + BD
20. Identify displacement reaction from the following chemical equations.
Multiple-Choice Questions
heat
a. CaO + H2O
→ Ca(OH)2 + Heat b. 2Pb(NO3)2(s)
→ 2PbO(s) + 4NO2(g) + O2(g)
electricity
c. 2H2O → 2H2 + O2 d. Zn(s) + CuSO4(aq)
→ ZnSO4(aq) + Cu(s)
21. In which of the following options, the given reactants will not result in the formation of the products?
a. Zn + CuSO4 b. Zn + MgSO4
c. Cu + AgNO3 d. Fe + CuSO4
22. Name the type of chemical reactions in which two chemical compounds react to form two new compounds by
the exchange of their ions.
2
a. Combination reactions b. Decomposition reactions
(QUESTION BANK)
Chapter 1: CHEMICAL REACTIONS AND EQUATIONS
1. What are the substances that take part in a chemical reaction called?
a. Reactants b. Products
c. Catalysts d. Activators
2. What are the reactions which occur with the absorption of energy called?
a. Exothermic reactions b. Endothermic reactions
c. Redox reactions d. Oxidation reactions
3. Magnesium ribbon burns in air to form
a. magnesium hydroxide. b. magnesium oxide.
c. magnesium carbonate. d. magnesium sulphate.
4. In which type of chemical reactions two or more reactants combine to form a single product?
a. Combination reactions b. Decomposition reactions
c. Displacement reactions d. Double displacement reactions
5. The following chemical equation
N2 + 3H2
→ 2NH3
is an
example of reaction.
a. combination b. decomposition
c. displacement d. double displacement
6. Which of the following equations can be regarded as a general chemical equation for combination reactions?
a. A + B
→ AB b. AB
→ A+B
c. AB + C
→ AC + B d. AB + CD
→ AC + BD
7. What are the chemical reactions in which a single reactant breaks down to give two or more products called?
a. Redox reactions b. Decomposition reactions
c. Displacement reactions d. Double displacement reactions
8. Which of the following chemical equations is an example of decomposition reaction?
a. 2Mg + O2
→ 2MgO b. 2H2 + O2
→ 2H2O
heat
c. CaCO3
→ CaO + CO2 d. Fe + CuSO4
→ FeSO4 + Cu
9. The following equation can be regarded as the general chemical equation for reactions.
AB
→ A+B
Multiple-Choice Questions
a. combination b. decomposition
c. displacement d. double displacement
10. reactions are the opposite of combination reactions.
a. Decomposition b. Displacement
c. Double displacement d. Redox
11. In a thermal decomposition reaction, the decomposition is brought about by
a. heat. b. sunlight.
1
, c. UV light. d. electricity.
12. Decomposition of a chemical compound by the action of light is known as
a. hydrolysis. b. photolysis.
c. electrolysis. d. cytolysis.
13. Which of the following chemical reactions is used in black and white photography?
heat heat
a. CaCO3
→ CaO + CO2 b. 2FeSO4
→ Fe2O3 + SO2 + SO3
sunlight electricity
c. 2AgBr
→ 2Ag + Br2 d. 2H2O → 2H2 + O2
14. When silver chloride is left open in sunlight, it turns grey after some time due to the
a. formation of silver oxide and chlorine.
b. reaction of silver chloride with oxygen present in the air.
c. reaction of silver chloride with moisture present in the air.
d. decomposition of silver chloride into silver and chlorine by light.
15. A chemical equation is balanced to satisfy the
a. law of conservation of mass. b. law of constant proportions.
c. law of multiple proportions. d. law of combining volumes.
16. When calcium carbonate is heated, the gas formed is allowed to pass through freshly-prepared lime water. What
change will be observed in the lime water?
a. The lime water will turn milky. b. The lime water will turn black.
c. A brown ring will be formed in the lime water. d. No change will be observed.
17. Name the chemical reaction in which a more reactive element displaces a less reactive element from the latter’s
salt solution.
a. Combination reaction b. Decomposition reaction
c. Displacement reaction d. Double displacement reaction
18. Which of the following observations will be made when a copper coin is placed in a test tube containing ferrous
sulphate solution?
a. The ferrous sulphate solution will turn blue and a grey substance will be deposited on the copper coin.
b. The ferrous sulphate solution will turn colourless and a grey substance will be deposited on the copper coin.
c. The ferrous sulphate solution will turn colourless and a reddish–brown substance will be deposited on the
copper coin.
d. No change will occur.
19. Which of the following equations can be regarded as a general chemical equation for displacement reactions?
a. A + B
→ AB b. AB
→ A+B
c. AB + C
→ AC + B d. AB + CD
→ AC + BD
20. Identify displacement reaction from the following chemical equations.
Multiple-Choice Questions
heat
a. CaO + H2O
→ Ca(OH)2 + Heat b. 2Pb(NO3)2(s)
→ 2PbO(s) + 4NO2(g) + O2(g)
electricity
c. 2H2O → 2H2 + O2 d. Zn(s) + CuSO4(aq)
→ ZnSO4(aq) + Cu(s)
21. In which of the following options, the given reactants will not result in the formation of the products?
a. Zn + CuSO4 b. Zn + MgSO4
c. Cu + AgNO3 d. Fe + CuSO4
22. Name the type of chemical reactions in which two chemical compounds react to form two new compounds by
the exchange of their ions.
2
a. Combination reactions b. Decomposition reactions
