which among the following pairs of ions cannot be separated by `H_(2)S` in the presence of dilute `HCl` ?

Options

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

Answer

A

Explanation

`Br^(3+)` and `Sn^(4+)` ions belong to the same group (group II). They cannot be separated by passing `H_(2)S` through the mixture solution in the presence of dilute HCl