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A blue colouration is not obtained when

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anhydrous CuSO₄ is dissolved in water.

ammonium hydroxide dissolves in copper sulphate.

copper sulphate solution reacts with $K_{4} [Fe (CN)_{6}]$ .

ferric chloride reacts with sod. ferrocyanide.

answer is B.

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Detailed Solution

$2 {CuSO}_{4} + K_{4} [Fe (CN)_{6}] ⟶ \underset{Chocolate ppt .}{{Cu}_{2} [Fe (CN)_{6}] ↓ + 2 K_{2} {SO}_{4}}$

Rest of the given reactions forms blue coloration.

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