On passing H_2S gas,a black precipitate of II | vedclass

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Question

(B) In the qualitative analysis of basic radicals,$II$ group cations form sulfides upon passing $H_2S$ gas in the presence of dilute $HCl$. The sulfid

Vedclass · Accepted Answer

$Cd^{2+}$

Vedclass · Answer

(B) In the qualitative analysis of basic radicals,$II$ group cations form sulfides upon passing $H_2S$ gas in the presence of dilute $HCl$. The sulfides of $Pb^{2+}$,$Hg^{2+}$,and $Cu^{2+}$ are black in color. However,$CdS$ (Cadmium sulfide) is yellow in color. Therefore,if a black precipitate is obtained,the mixture does not contain $Cd^{2+}$.

On passing $H_2S$ gas,a black precipitate of $II$ group is obtained. The mixture may not contain:

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