1.

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 :(a) Combination reaction(b) Displacement reaction(c) Decomposition reaction(d) Double displacement reaction

Answer»

The correct option is (d) Double displacement reaction.

The reactions in which two compounds react by an exchange of ions to form two new compounds are called double displacement reactions.



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