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Discuss the nature of bonding in the fol...

Discuss the nature of bonding in the following coordination entities on the basis of valence bond theory.
`[Co(C_(2)O_(4))_(3)]^(3-)`

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`[Co(C_(2)O_(4))_(3)]^(3-)` In this complex, the oxidation state of Co is +3.
Outer configuration of Co = `3d^(7)4s^(2)`
`Co^(3+)=3d^(6)4s^(0)`

Oxalate ion being a strong field ligand pair up the 3d-electrons, thus two out of the five 3d-orbitals are available foe oxalate ions.
`[Co(C_(2)O_(4))_(3)]^(3-)=`

Since all the electrons are paired, hence this complex is diamagnetic. It is an inner orbital complex because of the involvement of (n - 1) d-orbital for bonding.
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