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  4. Passing H2S in to a mixture of Mn2 +,Ni2 +,Cu2 + and Hg2 + ions in an acidified aqueous solution precipitates

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Q. Passing $H_{2}S$ in to a mixture of $Mn^{2 +},Ni^{2 +},Cu^{2 +}$ and $Hg^{2 +}$ ions in an acidified aqueous solution precipitates

NTA AbhyasNTA Abhyas 2020

Solution:

$H_{2}S$ 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 $H_{2}S$ .