1.

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

Answer»

`Ba^(2+),Zn^(2+)`
`Bi^(3+),Fe^(3+)`
`Cu^(2+),Pb^(2+)`
`HG^(2+),Bi^(3+)`

Solution :Precipitate is formed on pasing `H_(2)S` in ACIDIC medium i.e., ION must be of group II
`Cu^(2+),Pb^(2+),Hg^(2+),Bi^(3+)`


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