# 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 - Science

MCQ

Choose the correct option from given alternative:
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:

#### Options

• Combination reaction

• Displacement reaction

• Decomposition reaction

• Double displacement reaction

#### Solution

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.

Concept: Types of Chemical Change or Chemical Reaction - Double Displacement Reaction
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