Question

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

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

Answer 1

Answer: (B)

$H_{2}S$ in presence of aqueous solution precipitates sulphide of $Cu$ and $Hg$ (IInd group) apart from $\text{P}{\text{b}}^{+2},\text{B}{\text{i}}^{+3},\text{C}{\text{d}}^{+2},\text{A}{\text{s}}^{+3},\text{S}{\text{b}}^{+3}$ and $\text{S}{\text{n}}^{+2},\text{M}{\text{n}}^{2+},\text{N}{\text{i}}^{2+}$ are of IVth group so cannot be precipitated by $H_{2}S$ .