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On the basis of crystal field theory explain why Co(III) forms paramagnetic octahedral complex with weak field ligands whereas it forms diamagnetic octahedral complex with strong field ligands.

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With weak field ligands; ΔO < p, the electronic configuration of Co (III) will be t42g e2g and it has 4 unpaired electrons and is paramagnetic. With strong field ligands, Δ0 > p, the electronic configuration will be t62g e0g. It has no unpaired electrons and is diamagnetic.

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