Which of the following sulfides is completely | vedclass

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(A) In qualitative analysis,the precipitation of group $II$ sulfides depends on the concentration of $H_2S$ and the acidity of the solution. $HgS$ (me

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$HgS$

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(A) In qualitative analysis,the precipitation of group $II$ sulfides depends on the concentration of $H_2S$ and the acidity of the solution. $HgS$ (mercuric sulfide) has a very low solubility product $(K_{sp})$,which makes it the least soluble among the given sulfides. When an acidic solution containing $Hg^{2+}$ ions is treated with $H_2S$,$HgS$ precipitates. Upon dilution,the concentration of $H^+$ ions decreases,but $HgS$ remains precipitated due to its extremely low $K_{sp}$ value,ensuring complete precipitation compared to others like $PbS$,$CdS$,or $CuS$ which may redissolve or require specific conditions.

Which of the following sulfides is completely precipitated upon dilution of its acidic solution?

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