The ion that cannot be precipitated by both H | vedclass

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Question

(B) In qualitative inorganic analysis,$Pb^{2+}$,$Ag^{+}$,and $Sn^{2+}$ are precipitated as chlorides in Group $I$ or $II$ analysis using $HCl$. $Cu^{+

Vedclass · Accepted Answer

$Cu^{+}$

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(B) In qualitative inorganic analysis,$Pb^{2+}$,$Ag^{+}$,and $Sn^{2+}$ are precipitated as chlorides in Group $I$ or $II$ analysis using $HCl$. $Cu^{+}$ (cuprous ion) is generally unstable in aqueous solution and disproportionates into $Cu^{2+}$ and $Cu^0$. However,among the given options,$Cu^{+}$ is not a standard cation encountered in the systematic group analysis scheme for precipitation by $HCl$ or $H_2S$ in the same manner as the others,as it is not stable in aqueous solution. Therefore,$Cu^{+}$ is the ion that does not follow the standard precipitation behavior of the other listed ions.

The ion that cannot be precipitated by both $HCl$ and $H_2S$ is

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