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

Options

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

Answer

A

Explanation

`Cd^(2+),Sn^(2+)` belong to same gorup of basic radicals (II).