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Which of the following cyano complexes w...

Which of the following cyano complexes would exhibit the lowest value of paramagnetic behaviour?
[At. Nos. Cr = 24, Mn= 25, Fe = 26, Co=27]

A

`[Cr(CN)_(6)]^(3-)`

B

`[Mn(CN)_(6)]^(3-)`

C

`[Fe(CN)_(6)]^(3-)`

D

`[Co(CN)_(6)]^(3-)`

Text Solution

Verified by Experts

The correct Answer is:
D
`CN^(-)` is a strong field ligand and causes pairing of metal ion:
Co(III) : `3d^(6) or t_(2g)^(6)`
Since it contains no unpaired electron, it is diamagnetic or least paramagnetic.
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