Which of the following cations will not give ppt. with `H_2S` in an acidic solution ?

Options

A. `Hg^(2+ )`
B. `Co^(2+)`
C. `Ni^(2+)`
D. `Cu^(2+)`

Answer

B, C

Explanation

`Co^(2+) and Ni^(2+)` will not give ppt. with `H_2S` in acidic medium