H_2S will precipitate the sulphides of all th | vedclass

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(C) $H_2S$ is a weak acid that dissociates as $H_2S \rightleftharpoons 2H^{+} + S^{2-}$.In the presence of a dilute acidic medium,the concentration of

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The solution is dilute acidic

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(C) $H_2S$ is a weak acid that dissociates as $H_2S \rightleftharpoons 2H^{+} + S^{2-}$.In the presence of a dilute acidic medium,the concentration of $H^{+}$ ions increases significantly.According to the common ion effect,this suppresses the dissociation of $H_2S$,thereby decreasing the concentration of $S^{2-}$ ions.$Cu^{2+}$ (Group $II$) has a very low solubility product $(K_{sp})$ and precipitates even at low $S^{2-}$ concentrations.$Zn^{2+}$ (Group $IV$) has a higher $K_{sp}$ and requires a higher concentration of $S^{2-}$ to precipitate.Therefore,to precipitate all these metals selectively or together,the control of $pH$ via dilute acidic conditions is essential.

$H_2S$ will precipitate the sulphides of all the metals from the solution of chlorides of $Cu, Zn$ and $Cd,$ if

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