1.

Which of the following pairs of ions cannot be seprated by `H_(2)S` in dilate HCl?A. `Bi^(3+) ,Sn^(4+)`B. `Al^(3+) ,Hg^(2+)`C. `Zn^(2+) ,Cu^(2+)`D. `Ni^(2+) ,Cu^(2+)`

Answer» Correct Answer - a
In the presence of HCI both ions are precipitate by `H_(2)S`
`Bi^(3+) + H_(2)S overset(HCI) to underset(Brown)(Bi_(2)S_(3))darr `
`Sn^(4+) + H_(2)S overset(HCI) to underset(yellow)(SnS_(2) darr)


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