Assertion- Reasoning type questions 9. Assertion : When ferrous sulphate crystals are heated strongly, its colour

changes from green to brown.

Reason : It undergoes displacement reaction.

10. Assertion : Respiration is an endothermic reaction.

Reason: Endothermic process absorbs energy.

11. Assertion: Brown fumes are produced when lead nitrate is heated.

Reason: Oxygen gas is produced due to the decomposition of lead nitrate.

12. Assertion: Calcium carbonate when heated gives calcium oxide and water.

Reason: On heating calcium carbonate, decomposition reaction takes

place.

13. Assertion: In a reaction of magnesium with oxygen, magnesium serves as a

reducing agent

Reason: The substance which gains oxygen in a chemical reaction is a

reducing agent.
Assertion: Rusting of iron is a chemical change.

Reason: The chemical properties of hydrated Fe2O3 are different from

iron and oxygen
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