The pair (s) of ions where both the ions...

The pair (s) of ions where both the ions are precipitate upon passing `H_(2)S` gas in presence of dilute `HCl`, is (are)

`Ba^(2+), Zn^(2+)`

`Bi^(3+), Fe^(3+)`

`Cu^(2+), Pb^(2+)`

`Hg^(2+), Bi^(3+)`

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The correct Answer is:

C, D

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