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Which of the following are the example of double salt ? (A) FeSO 4 .(NH 4 ) 2 SO 4 .6H 2 O (B) CuSO 4 .4NH 3 .H 2 O (C) K 2 SO 4 .Al 2 (SO 4 ) 3 .24H 2 O (D) Fe(CN) 2 .4KCN Choose the correct answer

1. B and D only
2. A and C
3. A, B and D only
4. A and B only

Correct answer: A and C

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