1.

Identify the correct order solubilityin apocous medium

Answer»

`Na_(2)S GT CuS gt ZnS`
`Na_(2)S gt ZuS gt CuS`
`ZnS gt Na_(2)S gt CuS `
`Na_(2)S gt CuS gt ZnS`

Solution :Higher the `K_(sp)` of sulphides more is thesolubility in aqueous medium
In the salt analysis `K_(sp)` sulphidesincreases FROMGROUP `1` of saltanlysis to group `IV` of saltanlysis `Cu^(+2)` ion is in group II whereas `Zn^(+2)` is INGROUP IV of saltanalysis
`:.` Solubility of `ZnS gt CuS`
since the `K_(sp)` of sulphides of sodiumis the bighest therefore it ishighlysoluble
Hence the answer is (B) i.e.solubility of `Na_(2)S gt ZnS CuS`


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