In presence of $ \mathrm{HCl}, \mathrm{H}_{2} \mathrm{~S} $ results the precipitation of Group-2 elements but not Gp-4 elements during qualitative analysis. It is due to

Question

In presence of $ \mathrm{HCl}, \mathrm{H}_{2} \mathrm{~S} $ results the precipitation of Group-2 elements but not Gp-4 elements during qualitative analysis. It is due to, higher concentration of $ S^{2} $, higher concentration of $ H^{+} $, lower concentration of $ S^{2-} $, lower concentration of $ H^{+} $

MARKS App · Accepted Answer

Dissociation of $ \mathrm{H}_{2} \mathrm{~S} $ is suppressed in presence of $ \mathrm{HCl} $ due to common ion effect. This decreases the $ \mathrm{S}^{2-} $ ion concentration and hence, only Group II radicals having low solubility product are precipitated.

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