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+)`

Answer

A

Explanation

Both `Bi^(3+)` and `Sn^(4+)` will precipitated out .
`Al^(3+), Hg^(2+)`, Only `Hg^(2+)` will precipitated out.
`Zn^(2+), Cu^(2+)`, Only `Cu^(2+)` will precipitated out.
`Ni^(2+), Cu^(2+)` ,Only `Cu^(2+)` will precipitated out.