In the presence of HCl,H_2S results in the pr | vedclass

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(C) The dissociation of $H_2S$ is given by the equilibrium: $H_2S \rightleftharpoons 2H^+ + S^{2-}$.In the presence of $HCl$,the concentration of $H^+

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lower concentration of $S^{2-}$

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(C) The dissociation of $H_2S$ is given by the equilibrium: $H_2S \rightleftharpoons 2H^+ + S^{2-}$.In the presence of $HCl$,the concentration of $H^+$ ions increases significantly.According to the common ion effect,this shift in equilibrium suppresses the dissociation of $H_2S$,resulting in a lower concentration of $S^{2-}$ ions.Group-$2$ metal sulfides have very low solubility products $(K_{sp})$,so they precipitate even at this low $S^{2-}$ concentration.Group-$4$ metal sulfides have higher $K_{sp}$ values and require a higher $S^{2-}$ concentration to precipitate,which is not achieved in the presence of $HCl$.

In the presence of $HCl$,$H_2S$ results in the precipitation of Group-$2$ elements but not Group-$4$ elements during qualitative analysis. It is due to

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