When H2S gas is passed through the blue solution of CuSO4, 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
a combination reaction.
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B
a displacement reaction.
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C
a decomposition reaction.
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D
a double displacement reaction.
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Solution
The correct option is D a double displacement reaction. CuSO4 + H2S→CuS + H2SO4. In this reaction, exchange of ions takes place between the reactants and so, is double displacement reaction.