1.

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

Answer»

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

Solution :`CN^(-)` is a strong FIELD ligand and causes pairing of metal ION:
Co(III) : `3d^(6) or t_(2g)^(6)`
Sinceit contains no unpaired ELECTRON, it is DIAMAGNETIC or least paramagnetic.


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