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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