MCQ Practice – Class 6 to 10

Q1. The reaction: 2Mg + O2 → 2MgO is an example of:

A. Displacement B. Combination C. Decomposition D. Double displacement

Q2. Which symbol represents evolution of gas?

A. (↑) B. (l) C. (s) D. (g)

Q3. The chemical formula of quicklime is:

A. CaCO3 B. CaO C. CaCl2 D. Ca(OH)2

Q4. Which reaction produces heat?

A. Decomposition reaction B. Exothermic reaction C. Physical change D. Endothermic reaction

Q5. Which reaction is also known as thermal decomposition?

A. Reaction caused by pressure B. Reaction in presence of light C. Reaction caused by heat D. Reaction in presence of electricity

Q6. Which reaction needs sunlight?

A. Photosynthesis B. Electrolysis of water C. Rusting D. Burning of coal

Q7. What type of reaction is: AB → A + B?

A. Neutralisation B. Displacement C. Decomposition D. Combination

Q8. What is formed when ferrous sulphate is heated?

A. FeSO4 only B. FeO + H2O C. Fe + O2 D. Fe2O3 + SO2 + SO3

Q9. Which of the following is NOT a type of chemical reaction?

A. Displacement B. Neutralisation C. Combination D. Evaporation

Q10. The substance that gains oxygen is said to be:

A. Neutralised B. Reduced C. Oxidised D. Decomposed

Quiz – Chemical Reactions and Equations