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[Fe(H(2)O)(6)]^(3+) is strongly paramagn...

`[Fe(H_(2)O)_(6)]^(3+)` is strongly paramagnetic whereas `[Fe(CN)_(6)]^(3-)` is weakly paramagnetic. Explain.

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Fe is in +3 oxidation state in both compounds with the configuration `3d^(5)`. In the presence of strong `CN^(-)` ligand, 3d electrons pair up leaving only one unpaired electron. The hybridisation is `d^(2)sp^(3)` forming inner orbital complex. In the presence of weak `H_(2)O` ligand, 3d electrons do not pair up. The hybridisation is `sp^(3)d^(2)` forming an outer orbital complex containing five unpaired electrons. Hence, it is strongly paramagnetic.
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