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) a combination reaction

(b) a displacement reaction

(c) a decomposition reaction

(d) a double displacement reaction​

Answer 1

Answer:

Answer is d Double Displacement reaction

Answer 2

Answer:

(d) Double displacement 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. This reaction is an example of a Double Displacement reaction. 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