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A blue colouration is not obtained when

1. Ammonium hydroxide dissolves in copper sulphate
2. Copper sulphate solution reacts with K4[Fe(CN)6]
3. Ferric chloride reacts with sod. ferrocyanide
4. Anhydrous CuSO4 is dissolved in water

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

Solution

When copper sulphate reacts with K4[Fe(CN)6], a brown precipitate of Cu2[Fe(CN)6] forms instead of a blue coloration. The other options involve reactions that produce blue-colored solutions.

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