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[Fe(CN)(6)]^(4-) and [Fe(H(2)O)(6)]^(2+)...

`[Fe(CN)_(6)]^(4-)` and `[Fe(H_(2)O)_(6)]^(2+)` are of different colours in dilute solutions. Why ?

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In both the complexes, Fe is in +2 state with the configuration `3d^(6)`, having four unpaired electrons. As the ligands `H_(2)O` and `CN^(-)` possess different crystal field splitting energy (`Delta_(0)`), they absorb different wavelengths of the visible light for d - d transition. Hence, the transmitted colours are different.
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