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

The reagent (s) that can selectively precipitate S^(2-) from a mixture

1.	The reagent (s) that can selectively precipitate S^(2-) from a mixture of S^(2-) and SO_(4)^(2-) in aqueous solution is (are)
Answer» `CuCl_(2)` `BaCl_(2)` `Pb (OOC CH_(3))_(2)` `Na_(2) [Fe(CN)_(5) NO]` Solution :`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