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Identify the correct order of solubility in aqueous medium:
A
$Na_2S > ZnS > CuS$
B
$CuS > ZnS > Na_2S$
C
$ZnS > Na_2S > CuS$
D
$Na_2S ZnS$
Detailed Solution
$Na_2S$ is an alkali metal salt and is freely soluble in water.
ZnS and CuS are sparingly soluble, and $K_{sp}$ of ZnS is greater than that of CuS.
So solubility: $Na_2S > ZnS > CuS$
ZnS and CuS are sparingly soluble, and $K_{sp}$ of ZnS is greater than that of CuS.
So solubility: $Na_2S > ZnS > CuS$