Which are amongst the following pairs of ions cannot be separated by `H_(2)S` is dilute `HCl` ?

Options

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

Answer

C

Explanation

Only `Ni^(2+)` gives precipiates with `H_(2)S`.