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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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In presence of`CN^(-)` , (a strong ligand) the 3d electrons pair up leaving only one unpaired electron. The hybridisation is `d^(2) sp^(3)` forming inner orbital complex. In the presence of `H_(2)O`, (a weak ligand), 3d electrons do not pair up. The hybridisation is `sp^(3) d^(2)` forming an outer orbital complex containing five unpaired electrons, it is strongly paramagnetic.
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