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Arrange the following complexes in order...

Arrange the following complexes in order of increasing crystal field splitting .
`[Fe(H_(2)O)_(6)]^(2+),[Fe(H_(2)O)_(6)]^(3+) , [FeCl_(6)]^(4-)` .

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Ligand `Cl^(-)` is lower in series than H,O and metal in +3 oxidation state have higher splitting than 2. Hence, order of increasing crystal field splitting : `[FeCI_(5)]^(4-)<[Fe(H_(2)O)_(6)]^(2+)`< `[Fe(H_(2)O)_(6)]^(3+)`
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