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When H(2)S gas is passed through aqueous...

When `H_(2)S` gas is passed through aqueous solution of `CuCl_(2), HgCl_(2), BiCl_(3)` and `CoCl_(2)` in the presence of excess of dilute HCl, it fails to precipitate

A

`CuS`

B

`HgS`

C

`Bi_(2)S_(3)`

D

`COS`

Text Solution

Verified by Experts

The correct Answer is:
D
The `k_(sp)` of CoS is quite high. In acidic medium, `S^(2-)` ion concentration gets suppressed. The concentration of `Co^(2+)` and `S^(2-)` ions remain less than the `k_(sp)` value of the salt. Therefore, CoS is not precipitated.
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