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

CuS

HgS

`Bi_(2)S_(3)`

CoS

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The correct Answer is:

a,b,c

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