1.

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

Answer» In both the complexes , Fe is in + 2 oxidation state with `d^(6)` configuration. This means that it has four unoaired electrons. Both `CN^(-)` ion and `H_(2)O` molecules which act as ligands occupy different relative positions in the spectrochemical series. they differ in crystal field spliting energy `(Delta_(0))` . quite obviously , they absorb radiations corresponding to different wavelength/frequencies from the visible region of light. (VIBGYOR) and the transmitted colours are also different. this means that the complexes have different colours in solutions.


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