1.

What are the limitation of VB theory ?

Answer»

Solution :Limitations of VB -THEORY :
`1`. It does not explain the colour of the complex.
`2`. It considers only the SPIN only magnetic MOMENTS and does not consider the other components of magnetic moments.
`3`. It does not provide a quantitative explanation as to why certain complexes are inner orbital complexes and the others are outer orbital complexes for the same metal. For example, `[Fe(CN)_(6)]^(4-)` is diamagnetic (low spin) whereas `[FeF_(6)]^(4-)` is paramagnetic (high spin).


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