1.

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

Answer»

CuSgtZnSgt`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 SALTS are highly soluble. `Cu^(2+)` belongs to the `II^(nd)` group in SALT ANALYSIS and is precipitated as `CuS`, whereas `Zn^(2+)` belongs to the IV group and is precipitated as ZnS
after CuS because of higher `K_(SP)` of `ZnS`.


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