Q.

A blue colouration is not obtained when

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a

Ammonium hydroxide dissolves in copper sulphate

b

Copper sulphate solution reacts with K4FeCN6

c

Fenic chloride reacts with sodium ferrocyanide

d

Anhydrous CuSO4 is dissolved in water

answer is B.

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Detailed Solution

CuSO4+K4FeCN6→no reaction4NH4OH+CuSO4→CuNH34SO4Deep blue+4H2OCuSO4Anhydrous+5H2O→CuSO4Blue.5H2O4FeCl3+3Na4FeCN6→Fe4FeCN63+12NaClFerric ferrocyanide    Prussian blue
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