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[Fe(H2O)6]^(3+) is strongly paramagnetic...

`[Fe(H_2O)_6]^(3+)` is strongly paramagnetic whereas `{Fe(CN)_6]^(3-)` is weakly paramagnetic Expain?

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Ans: In both cases, Fe is in .+3. oxidation state and has .d^3. configuratiơn. In presence of .CN-., the .3 d. electrons pair up leaving only, one unpaired. electron. The hybridization involyed is- .d^2 s p^3. forming innér orbital complex. In presence of .H_2 O_i. (a.weak ligand), .3 d. electrons do not pair up. The hybridization involved in such case is .s p^prime d^2. forming an.outer orbital complex. As it con.tains five unpaired electrons, it is strongly paramagnetic. figure
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Assertion : [Fe(H_2O)_6]^(3+) is strongly paramagnetic whereas [Fe(CN)_6]^(3-) is weakly paramagnetic. Reason : H_2O is a weak field ligand and CN^(-) is a strong field ligand.

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