Which one among the following pairs of ions cannot be separated by `H_(2)S` in dilute hydrochloric acid ?

Options

A. `Bi^(3+),Sn^(4+)`
B. `Al^(3+),Hg^(2+)`
C. `Zn^(2+),Cu^(2+)`
D. `Ni^(2+),Cu^(2+)`

Explanation

`Bi^(3+)` and `Sn^(4+)` belong to III group and as such cannot be separated by group III regent (`H_(2)S` is dil. HCl)