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 :

Passing H_(2)S gas into a mixture of Mn^(2+), Ni^(2+), Cu^(2+) and Hg^

1.	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 :
Answer» MNS and CUS CuS and HgS MnS and NiS NiS and HgS Solution :`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