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Choose the correct tests with respective observations. (A) CuSO 4 (acidified with acetic acid) + K 4 [Fe(CN) 6 ] → Chocolate brown precipitate. (B) FeCl 3 + K 4 [Fe(CN) 6 ] → Prussian blue precipitate. (C) ZnCl 2 + K 4 [Fe(CN) 6 ], neutralised with NH 4 OH → White or bluish white precipitate. (D) MgCl 2 + K 4 [Fe(CN) 6 ] → Blue precipitate. (E) BaCl 2 + K 4 [Fe(CN) 6 ], neutralised with NaOH → White precipitate. Choose the correct answer from the options given below :

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

Correct answer: A, B and C only

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