Identify the correct order of solubility of Na_(2)S, CuS and ZnS in aq

1.	Identify the correct order of solubility of Na_(2)S, CuS and ZnS in aqueous solution :
Answer» `CuS gt ZnS gt Na_(2)S` `ZnS gt Na_(2)S gt CuS` `Na_(2)S gt CuS gt ZnS` `Na_(2)S gt ZnS gt CuS` Solution :SODIUM sulphide `(Na_(2)S)` is a strong electrolyte and it readily ionises in aqueous solution. Out of ZnS and CuS, the latter gets precipitated more easily because its `KSP (8.5 xx 10^(-45))` is less than that of `ZnS (2.5 xx 10^(-22))`. Therefore the correct order of solubility is: `Na_(2)S gt ZnS gt CuS`

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