Question

(a) A2Y2
04. When hydrogen sulphide gas is passed through a blue solution of copper
sulphate, a black ppt of CuS is optained and the sulphuric acid so formed
remains in the schetion the reaction is an example of a
G) Compination reaction (ii) exchange of ions take place
(a) a ppt is produced
(iv) an insoluble salt is produced
(B) the correct option is
(a) and
(c) only)
(b) (i) and (iii)
(d) (i), (iii) and (iv)​

Answer 1

Answer:

H

2

S+

(blue solution)

CuSO

4

→

(black)

CuS

↓+H

2

SO

4

This reaction is an example of a 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 copper sulphide and sulphuric acid.

Hence, option D is correct.