Question

State any three observations in an activity, which may suggest that a chemical reaction has taken place.

Answer 1

Answer:

(i) Evolution of gas. For example: When sodium carbonate reacts with dilute hydrochloric acid, carbon dioxide gas is evolved. (ii) Formation of a precipitate. For example: When potassium iodide solution is added to a solution of lead nitrate, yellow precipitate of lead iodide is formed.

Explanation:

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