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A blue colouration is not obtained when...

A blue colouration is not obtained when

A

ammonium hydroxide dissolves in copper sulphate.

B

Copper sulphate solution reacts with `K_(4)[Fe(CN)_(6)]`.

C

Ferric chloride reacts with sodium ferrocyanide.

D

anhydrous white `CuSO_(4)` is dissolved in water.

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