Which pair of ions cannot be seperated b...

Which pair of ions cannot be seperated by `H_(2)S` in dil/HCl

`Bi^(3+),Sn^(4+)`

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

`Al^(3+),Ni^(2+)`

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

Verified by Experts

The correct Answer is:

Only `Ni^(2+)` give ppt in presence of `NH_(4)OH`, not in presence of HCl.

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