Passing H_2S gas into a mixture of Mn^{2+},Ni | vedclass

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(A) In an acidified aqueous solution,the concentration of $S^{2-}$ ions is very low due to the common ion effect of $H^+$ ions from the acid.Only the

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$CuS$ and $HgS$

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(A) In an acidified aqueous solution,the concentration of $S^{2-}$ ions is very low due to the common ion effect of $H^+$ ions from the acid.Only the sulphides of Group $II$ cations,such as $Cu^{2+}$ and $Hg^{2+}$,have a sufficiently low solubility product $(K_{sp})$ to precipitate under these conditions.The sulphides of $Mn^{2+}$ and $Ni^{2+}$ (Group $III$ and $IV$ cations) have higher $K_{sp}$ values and remain in the solution.Therefore,$CuS$ and $HgS$ are precipitated.Hence,the correct option is $A$.

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

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