Question

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

Answer 1

Correct Answer - B
`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