Question

Which of the following is precipitated as sulphide in acidic solution
(A) Ni+2
(B) Zn+2
(C) Cu +2
(D)
Mn+2​

Answer 1

Explanation:

In cationic estimation group, Cu

2+

and Hg

2+

are present in group II while Mn

2+

and Ni

2+

are present in group IV.

The group reagent of groups II is H

2

S gas in presence of HCl (dil) while of group IV it is H

2

S gas in presence of NH

4

OH. So, H

2

S gas when passed in acidified solutions of given cations only Cu

2+

and Hg

2+

will get precipitated as CuS and HgS.