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  4. A blue colouration is not obtained when

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Q. A blue colouration is not obtained when

AIPMTAIPMT 1989The d-and f-Block Elements

Solution:

$CuSO _{4}+ K _{4}\left[ Fe ( CN )_{6}\right] \rightarrow$ No reaction
$4 NH _{4} OH + CuSO _{4} \rightarrow \underset{\text{Deep blue colour}}{\left[ Cu \left( NH _{3}\right)_{4}\right] SO _{4}}+4 H _{2} O$
$\underset{\text{Anhydrous}}{CuSO _{4}}+5 H _{2} O \rightarrow \underset{\text{Blue colour}}{CuSO _{4} .5H _{2} O}$
$4 FeCl _{3}+3 Na _{4}\left[ Fe ( CN )_{6}\right] \rightarrow$
$\underset{\text{Ferric ferrocyanide (Prussian blue)}}{Fe _{4}\left[ Fe ( CN )_{6}\right]} +12 NaCl$