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

Options

  1. AC u C l 2
  2. BB a C l 2
  3. CP b O O C C H 3 2
  4. DN a 2 F e C N 5 N O

Correct answer

A. C u C l 2

Step-by-step solution

(A) C u C l 2 + S 2 - s o l n s o l n         → C u S ↓ + B l a c k   p p t .         2 C l - S o l n C u C l 2 + S O 4 2 - s o l n s o l n         → N o   p p t . (B) B a C l 2 + S 2 - s o l n s o l n         → B a S + N o   p p t .         2 C l - S o l n   B a C l 2 + S O 4 2 - s o l n s o l n         → B a S O 4 ↓ + W h i t e   p p t

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