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[Co(NH(3))(6)]^(3+) & [CoF(6)]^(3-) both...

`[Co(NH_(3))_(6)]^(3+) & [CoF_(6)]^(3-)` both are complexes of Co(III), but `[Co(NH_(3))_(6)]^(3+)` is diamagnetic while `[Co(F_(6)]^(3-)` is paramagnetic with `mu=4.90 BM`. Explain.

Text Solution

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Since ammonia is a strong field ligand so can pair up the electrons of Co(III), so will form an inner d-orbital complex having zero magnetic moment while fluoride being a weak field ligand can not pair up electrons and forms outer d-complex with higher magnetic moment equal to four unpaired electrons.
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