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The reagent (s) that can selectively pre...

The reagent (s) that can selectively precipitate `S^(2-)` from a mixture of `S^(2-)` and `SO_(4)^(2-)` in aqueous solution is (are)

A

`CuCl_(2)`

B

`BaCl_(2)`

C

`Pb (OOC CH_(3))_(2)`

D

`Na_(2) [Fe(CN)_(5) NO]`

Text Solution

Verified by Experts

The correct Answer is:
A
`CuCl_(2)` gives a black precipitate with `S^(2-)` ions.
`Cu^(2+) + S^(2-) rarr underset(("Black ppt."))(CuS)`
`CuSO_(4)` formed remains soluble in aqueous solution
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