In qualitative analysis,in order to detect II | vedclass

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(C) $H_2S$ is a weak acid that dissociates as $H_2S \rightleftharpoons 2H^+ + S^{2-}$.When $HCl$ is added,the concentration of $H^+$ ions increases si

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Decrease the dissociation of $H_2S$

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(C) $H_2S$ is a weak acid that dissociates as $H_2S \rightleftharpoons 2H^+ + S^{2-}$.When $HCl$ is added,the concentration of $H^+$ ions increases significantly.According to Le Chatelier's principle,this common ion effect suppresses the ionization of $H_2S$,thereby decreasing the concentration of $S^{2-}$ ions.This ensures that only the solubility product $(K_{sp})$ of $II$ group metal sulfides is exceeded,allowing for their selective precipitation.

In qualitative analysis,in order to detect $II$ group basic radicals,$H_2S$ gas is passed in the presence of dilute $HCl$ to:

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