Question

When hydrogen sulphide gas is passed through a blue solution of copper sulphate, a black precipitate of copper sulphate is obtained and the sulphuric acid so formed remains in the solution. The reaction is an example of :-

Select one:

a. A combination reaction

b. A displacement reaction

c. A decomposition reaction

d. A double decomposition reaction

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Answer 1

Answer:

A combination reaction

Explanation:

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.

Answer 2

Answer:

d. A double decomposition reaction

Explanation:

Double displacement is a type of chemical reaction where two compounds react, and the positive ions (cation) and the negative ions (anion) of the two reactants switch places, forming two new compounds or products. H2s + CuSO4➡️CuS + H2SO4