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:

पर्याय

• Combination reaction

• Displacement reaction

• Decomposition reaction

• Double displacement reaction

Answer 1

Double displacement reaction

Explanation:

In the case of a double displacement reaction, two reactants exchange their ions and form new products.

\[\ce{\underset{\text{Hydrogen sulphide}}{H2S(g)}+\underset{\text{Copper sulphate}}{CuSO4(aq)}->\underset{\text{Copper sulphide,black ppt}}{CuS(s)}+\underset{\text{Sulphuric acid}}{H2SO4(aq)}}\]

This reaction is an example of a double displacement reaction.

Hence, the correct answer is Double displacement reaction.