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

Explain `[Fe(H_2O)_6]^(3+)` is paramagnetic.

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In `[Fe(H_2O)_6]^(3+). Fe`. Is in +3 O.S. with configration `3d^5`. Now `H_2O` is a weak ligand. In its presence 3d electrons do not pair up and the hybridization is `sp^3 d^2` forming on outer orbital complex containing five unpaired electrons, so it is highly paramagnetic.
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