1.

Using valence bond theory, predict the shape and magnetism (paramagnetic or diamagnetic) of [Co(CO)_(4)]^(-).

Answer»

Solution :ELECTRONIC configuration of Co : `4s^(2)3d^(7)`
Electronic configuration of `CO^(-1) = 4s^(2)3d^(8)`
CO is a strong ligand causing pairing of ELECTRONS. Thus, `Co^(-1) : 4s^(0)3d^(10)`

It has `SP^(3)` hybridisation and tetrahedral geometry. As there are no unpaired electrons, the complex ion is diamagnetic.


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