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

1. CuCl 2
2. BaCl 2
3. Pb(OOCCH 3 ) 2
4. Na 2 [Fe(CN) 5 NO]

Correct answer: CuCl 2

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