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Which one of the cyano complexes would e...

Which one of the cyano complexes would exhibit the lowest value of para magnetic behaviour ?
(At. No. 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
Cr(III) is `d^(3)` , Mn(III) is `d^(4)`, Fe(III) is `4d^(5)`, Co(III) is `d^(6)`
`CN^(-)` is a strong ligand pairing can take place whereever required to make two empty d-orbitals available for `d^(2)sp^(3)` hybridisation.

Co(III) has no unpaired electron. Hence it is least paramagnetic.
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