Question

Passing H₂S gas into a mixture of Mn²⁺ and Ni²⁺, Cu²⁺, ions in an acidified aqueous solution precipitates.

Options

• CuS and HgS

• MnS and HgS

• MnS and NiS

• NiS and Hg

Answer 1

CuS and HgS

Explanation:

Cu²⁺ and Hg²⁺ belong to the second group of qualitative analysis. The reagent is H₂S in acid medium.

\[\ce{HCl -> H^{-} + Cl-}\]

\[\ce{H2S ⇌ 2H^{+} + S^{2-}}\]