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  Applications of valence bond theory

Applications of valence bond theory:

1) Nickel atom:

Outer electronic configuration 3d84s2

2114_Applications of Vb theory.jpg



Number of unpaired electrons = 2

∴ µs = √2(2+2) = 2.83 BM

As the hybridisation is sp3, the geometry of the molecule is tetrahedral.

2) [Ni(CN)4]2- :

The other possible geometry for the 4 coordinated complex is the square planar configuration including dsp2 hybridisation.

2092_Applications of Vb theory2.jpg

The ligand CN- is an influential ligand. Therefore it forces the unpaired electrons to pair up in d orbitals. Therefore this complex ion does not have unpaired electrons. It is diamagnetic.

2174_Applications of vb theory3.jpg

The geometry of the above molecule is square planar.

 

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