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» CuS and HgS MnS and CuS MnS and NiS NiS and HgS Solution :`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+)`).