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CGP EDU Academic Team
Published on: August 13, 2026
[Co(NH 3 ) 6 ] 3+ & [CoF 6 ] 3– both are complexes of Co(III), but [Co(NH 3 ) 6 ] 3+ is diamagnetic while [CoF 6 ] 3– is paramagnetic with μ = 4.90 B.M. Explain.
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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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