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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-)` .

Text Solution

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