Which one among the following pairs of ions c | vedclass

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(A) In the presence of dilute $HCl$,$H_2S$ provides a low concentration of $S^{2-}$ ions due to the common ion effect. This concentration is sufficien

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$Bi^{3+}, Sn^{4+}$

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(A) In the presence of dilute $HCl$,$H_2S$ provides a low concentration of $S^{2-}$ ions due to the common ion effect. This concentration is sufficient to exceed the solubility product $(K_{sp})$ of group $II$ metal sulphides (like $Bi_2S_3, SnS_2, HgS, CuS$) but not group $IV$ metal sulphides (like $ZnS, NiS$). $Bi^{3+}$ and $Sn^{4+}$ both belong to group $II$ and will both precipitate as sulphides in dilute $HCl$,making them inseparable by this method.

Which one among the following pairs of ions cannot be separated by $H_2S$ in dilute hydrochloric acid?

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