When `H_(2)S` gas is passed through the solutions of `CuCl_(2),PbCl_(2),HgCl_(2)` and `ZnCl_(2)`, then which one of the following is not obtained as a precipitate ?

Options

A. `CuS`
B. `PbS`
C. `ZnS`
D. `HgS`

Answer

3

Explanation

ZnS is not obtained as `k_(sp)` of the zinc sulphide is very high. To precipitate `Zn^(2+)` high concentration of `S^(2-)` ions are required.