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(A) In an acidic medium,the ionization of $H_2S$ is suppressed due to the common ion effect,resulting in a very low concentration of $S^{2-}$ ions. On

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$CuS$ and $HgS$

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(A) In an acidic medium,the ionization of $H_2S$ is suppressed due to the common ion effect,resulting in a very low concentration of $S^{2-}$ ions. Only the metal sulfides with very low solubility product constants $(K_{sp})$ can precipitate under these conditions. $Cu^{2+}$ and $Hg^{2+}$ have very low $K_{sp}$ values for their sulfides ($CuS$ and $HgS$),whereas $MnS$ and $NiS$ have higher $K_{sp}$ values and require a basic medium to precipitate. Therefore,$CuS$ and $HgS$ will precipitate.

When $H_2S$ gas is passed through a mixture containing $Mn^{2+}$,$Ni^{2+}$,$Cu^{2+}$,and $Hg^{2+}$ ions in an acidic aqueous solution,which of the following will precipitate?

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