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Choose the correct tests with respective observations. (A) CuSO4 (acidified with acetic acid) + K4[Fe(CN)6] → Chocolate brown precipitate. (B) FeCl3 + K4[Fe(CN)6] → Prussian blue precipitate. (C) ZnCl2 + K4[Fe(CN)6], neutralised with NH4OH → White or bluish white precipitate. (D) MgCl2 + K4[Fe(CN)6] → Blue precipitate. (E) BaCl2 + K4[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

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

Solution

Options A, B, and C correctly describe the expected reactions between the given reagents and potassium ferrocyanide, producing the specified precipitates. Each reaction aligns with known chemical behavior, such as the formation of a chocolate brown precipitate with CuSO4 and a Prussian blue precipitate with FeCl3.

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