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[Fe(CN)(6)]^(4-) and [Fe(H(2)O)(8)]^(2+)...

`[Fe(CN)_(6)]^(4-)` and `[Fe(H_(2)O)_(8)]^(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)`, i.e., it has four unpaired electrons. As the ligands `H_(2)O and.`CN^(-)` posses, different crystal field splitting energy(triangle_(o))`, they absorb different components of the visible light (VIBGYOR) for d-d transition. Hence, the transmitted colours are different
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