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

Options

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

Answer

A

Explanation

`H_(2)S` in acidic medium precipitates radicals of Group 2 of quantitative analysis, i.e. `Cu^(2+), Hg^(2+)`, (and `Pb^(2+), Bi^(3+), Cd^(2+), As^(3+), Sb^(3+), Sn^(2+)`).