In the analysis of Group-II basic radicals,H_ | vedclass

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(C) The group-$II$ basic radicals are precipitated as their sulfides. $H_2S$ is a weak electrolyte and dissociates as: $H_2S \rightleftharpoons 2H^+ +

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The dissociation of $H_2S$ decreases.

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(C) The group-$II$ basic radicals are precipitated as their sulfides. $H_2S$ is a weak electrolyte and dissociates as: $H_2S \rightleftharpoons 2H^+ + S^{2-}$. In the presence of dilute $HCl$,the concentration of $H^+$ ions increases due to the common ion effect. According to Le Chatelier's principle,this suppresses the dissociation of $H_2S$,thereby lowering the concentration of $S^{2-}$ ions. This low concentration of $S^{2-}$ is sufficient to exceed the solubility product $(K_{sp})$ of group-$II$ sulfides but not that of group-$IV$ sulfides,allowing for selective precipitation.

In the analysis of Group-$II$ basic radicals,$H_2S$ gas is passed in the presence of dilute $HCl$ because...

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