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

Options

A. `CuS gt ZnS gt Na_(2)S`
B. `ZnS gt Na_(2)S gt CuS`
C. `Na_(2)S gt CuS gt ZnS`
D. `Na_(2)S gt ZnS gt CuS`

Answer

B

Explanation

Alkali metal salts are usually more soluble than the salts of transition metals. Also, CuS is less soluble than ZnS because of `3d^(9)` configuration of `Cu^(2+)` Therefore, solubility order is `Na_(2)S > ZnS > CuS`