The dissolution of copper sulfate in water is a physical change whereas that of granulated zinc in dilute hydrochloric acid is a chemical change. Explain.

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Solution

When $C u S O_{4}$ is dissolved in water, no chemical reaction takes place since no new substance is getting formed. Thus, it is a physical change.

The dissolution of zinc granules in dil. $H C l$ is a chemical change because zinc reacts with hydrochloric acid to form zinc chloride and hydrogen gas. The reaction is: $Z n + 2 H C l \to Z n C l_{2} + H_{2}$

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