Question

Passing $H_{2}S$ gas into a mixture of $M{n}^{2+},N{i}^{2+},C{u}^{2+}$ and $H{g}^{2+}$ ions in an acidified aqueous solution precipitates:

• A. $CuS$ and $HgS$
• B. $MnS$ and $CuS$
• C. $MnS$ and $NiS$
• D. $NiS$ and $HgS$

Answer 1

The correct option is A $CuS$ and $HgS$

$H_{2}S$ in presence of aqueous acidified solution precipitates as sulphide of $Cu$ and $Hg$ as $CuS$ and $HgS$. But the solubility product of $M{n}^{2+},N{i}^{2+}$ are higher thus they remain unaffected.

Hence, the correct option is $\text{A}$.