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A blue colouration is not obtained u,hen (a) ammonium hydroxide dissolves in copper sulphate

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A blue colouration is not obtained u,hen

(a) ammonium hydroxide dissolves in copper sulphate

(b) copper sulphate solution reacts with K4[Fe(CN)5]

(c) ferric chloride reacts with sod. ferrocyanide

(d) anhydrous CuSO4 is dissolved in water.

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Correct option (b) copper sulphate solution reacts with K4[Fe(CN)5]

Explanation :

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