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[Cr(NH3)6]^3+ is paramagnetic while [Co(CN)6]^3- is diamagnetic, give reason.

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 [Cr(NH3)6]3+ is paramagnetic while [Co(CN)6]3- is diamagnetic, give reason.

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Through NH3 is a strong field ligand but there are three unpaired electrons present, so it will be paramagnetic. In [Co(CN)6]3-, CN– is also a strong field ligand but due to 3d6 configuration in Co3+, pairing takes place and the arrangement of electron pairs for [Co(CN)6]3- is:

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