Passing `H_2S gas into a mixture of `Cu^(2+)`, `Mn^(2+)`, `Ni^(2+)` and `Hg^(2+)` ions, in acidified aqueous solution precipitates

Options

A. MnS and CuS
B. CuS and HgS
C. MnS and NiS
D. NiS and HgS

Answer

B

Explanation

`Cu^(2+)` and `Hg^(2+)` ions belong to group II of basic radicals. In the acidic solution, both are precipitated as CuS and HgS having black colour. `Mn^(2+)` and `Ni^(2+)` ions belong to group IV of basic radicals and remain in solution