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Pb^(2+), Cu^(2+), Zn^(2+) and Ni^(2+) io...

`Pb^(2+), Cu^(2+), Zn^(2+) and Ni^(2+)` ions are present in a given acidic solution. On passing hydrogen sulphide gas through this solution, the available precipitate will contain

A

PbS and NiS

B

PbS and CuS

C

CuS and ZnS

D

CuS and NiS

Text Solution

Verified by Experts

The correct Answer is:
B
As both `Pb^(2+)` and `Cu^(2+)` require acidic medium and low concentration of `S^(2-)` to be precipitated as sulphide and low concentration of `S^(2-)` is provided by common ion effect of HCl and `H_2S`.
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