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Identify the correct order of solubility...

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

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`

Text Solution

Verified by Experts

`Na_(2)S` is freely soluble in water. `K_(sp)` of group II (CuS) is less than the `K_(sp)` of group IV (ZnS) ions. Thus correct order is `Na_(2)S` gt ZnS gt CuS. (More the `K_(sp)`, for similar compounds more is the solubility)
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