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[Cr(NH3)6]^3+ is paramagnetic while [Ni(CN)4]^2- is diamagnetic. Explain why?

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[Cr(NH3)6]3+ is paramagnetic while [Ni(CN)4]2- is diamagnetic. Explain why?

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Cr(24): [Ar] 4s13d5 

Cr3+(24): [Ar] 4s°3d3 

It is paramagnetic due to the presence of unpaired electrons. 

It has a square planar structure, and it is diamagnetic due to the absence of unpaired electrons.

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