give two observations in an activity which may suggest that a chemical reaction has taken place. give examples to illustrate your ans
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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.
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