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 : a) combination reaction b) displacement reaction c) decomposition reaction d) double displacement reaction ​

Answer 1

Answer:

its answer is b i.e. displacement reaction.....

Answer 2

Answer: D) double displacement reaction

Explanation: H 2  S+  CuSO  4→  Cu  2  S ↓+H  2  SO  4

This reaction is an example of double displacement reaction.

when two compounds react, the positive ions and negative ions of two reactants switch places, forming two new products.

Here, hydrogen sulphide combines with blue copper sulphate solution to form cupper sulphide and sulphuric acid.

Hence, option D is correct.