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Question

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
Easy

Solution

(d)Double displacement reaction

Double displacement is a chemical reaction in which the positive ions (cation) and negative ions (anion) of two reactants swap positions, resulting in the formation of two new compounds or products. H₂S + CuSO₄→ CuS + H₂SO₄

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