qA blue colour inorganic compound when heated with Hydrogen sulphide gives black precipitate and aqueous solution of Sulphuric acid. Write the balanced chemical equation.
q Identify which one of the following is a chemical change with reason for the same:
1.souring of milk 2.evaporation of water 3.dissolution of sugar in water

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Solution

1) CuSO₄ + H₂S â†’ CuS + H₂SO_{4 (aq)}
(Blue color) (Black precipitate)
2) The answer will be souring of milk , because in a chemical change a new compound is formed and it is irreversible in nature.
And among all the options because souring of milk causes the coagulation of milk protein due to bacterial action and curd is formed. From curd milk can not be restored. Which means it is a chemical change.

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