The cation that will not be precipitated by H | vedclass

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(C) In qualitative inorganic analysis,cations are divided into groups based on their precipitation reactions.$Pb^{2+}$ (Group $II$),$Cu^{2+}$ (Group $

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$Co^{2+}$

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(C) In qualitative inorganic analysis,cations are divided into groups based on their precipitation reactions.$Pb^{2+}$ (Group $II$),$Cu^{2+}$ (Group $II$),and $As^{3+}$ (Group $II$) are precipitated as sulfides by $H_2S$ in the presence of $dil. \ HCl$ due to the low solubility product of their sulfides.$Co^{2+}$ belongs to Group $IV$ and is not precipitated by $H_2S$ in the presence of $dil. \ HCl$ because the concentration of $S^{2-}$ ions is too low due to the common ion effect of $H^+$.$Co^{2+}$ is precipitated as $CoS$ only in the presence of $NH_4OH$ and $H_2S$ (Group $IV$ reagent).

The cation that will not be precipitated by $H_2S$ in the presence of $dil. \ HCl$ is

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