Passing H_ 2S gas into a mixture of Mn^ 2+ , Ni^ 2+ , Cu^ 2+ , Hg^ 2+ ions in acidified aqueous solution precipitates :

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

MCQ

Passing $\ce{H_2S}$ gas into a mixture of $\mathrm{Mn}^{2+}, \mathrm{Ni}^{2+}, \mathrm{Cu}^{2+}, \mathrm{Hg}^{2+}$ ions in acidified aqueous solution precipitates :

✓
$\text{CuS}$ and $\text{HgS}$
B
$\text{MnS}$ and $\text{CuS}$
C
$\text{MnS}$ and $\text{NiS}$
D
$\text{NiS}$ and $\text{HgS}$

✓

Answer

Correct option: A.

$\text{CuS}$ and $\text{HgS}$

$\text{Cu}^{2+}$ and $\text{Hg}^{2+}$ lie in $\text{II}^{nd}$ group of qualitative analysis $\ce{H_2S}$ in acid medium is reagent for it.
$\text{HCl} \rightarrow\ \ce{H^+ + Cl}^-$
$\ce{H_2S}\ \leftrightharpoons \ 2H^+ + S^{2-}$

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