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Prussian blue is formed when

1. Ferrous sulphate reacts with FeCl3
2. Ferric sulphate reacts with K4[Fe(CN)6]
3. Ferrous ammonium sulphate reacts with FeCl3
4. Ammonium sulphate reacts with FeCl3

Correct answer: Ferric sulphate reacts with K4[Fe(CN)6]

Solution

Prussian blue is formed when ferric ions (Fe³⁺) react with potassium ferrocyanide (K₄[Fe(CN)₆]), producing a deep blue precipitate of ferric ferrocyanide.

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