When H_2S gas is passed through an HCl soluti | vedclass

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(D) In qualitative inorganic analysis,$Cu^{2+}$,$Hg^{2+}$,and $Bi^{3+}$ belong to Group-$II$ cations. These cations precipitate as their respective su

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$CoS$

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(D) In qualitative inorganic analysis,$Cu^{2+}$,$Hg^{2+}$,and $Bi^{3+}$ belong to Group-$II$ cations. These cations precipitate as their respective sulfides $(CuS, HgS, Bi_2S_3)$ in the presence of $H_2S$ gas in an acidic medium $(HCl)$.$Co^{2+}$ belongs to Group-$IV$ cations. Group-$IV$ sulfides (like $CoS, NiS, MnS, ZnS$) are soluble in acidic medium $(HCl)$ due to their higher solubility product $(K_{sp})$ values compared to Group-$II$ sulfides.Therefore,$CoS$ will not precipitate in the presence of $HCl$.

When $H_2S$ gas is passed through an $HCl$ solution containing $CuCl_2, HgCl_2, BiCl_3$,and $CoCl_2$,which of the following will not precipitate?

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