When hydrogen sulphide gas is passed through a blue solution of copper sulphate, a black precipitate of copper sulphide is obtained and the sulphuric acid so formed remains in the solution. The reaction is an example of a :

1. Combination reaction
2. Displacement reaction
3. Decomposition reaction
4. Double displacement reaction

Correct Answer: (d) Double displacement reaction

Explanation: When hydrogen sulphide gas is passed through a blue solution of copper sulphate, a black precipitate of copper sulphide is obtained and the sulphuric acid so formed remains in the solution.  This reaction is an example of a Double Displacement reaction.

$H_2S (g) + CuSO_4 (aq) \rightarrow CuS (s) + H_2SO_4 (aq)$

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Updated on: 10-Oct-2022

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