Question

Co2+ is easily oxidised to Co3+ ion in the presence of ligands . WHY?

Answer 1

Co+2 ions can be easily oxidized to Co+3 ions because the crystal field stabalisation energy of Co+3 ion with a d6 configuration is higher than Co+2 ion with a d7 configuration.
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Answer 2

Hey dear,

● Answer -
- Electronic configuration of cobalt is -
[Co] => [Ar] 3d7 4s2
[Co2+] => [Ar] 3d7 4s0
[Co3+] => [Ar] 3d6 4s0
- Co2+ has 7 valence electrons in d orbital, hence one electron must be unpaired at any condition, hence Co2+ is less stable.
- Co3+ has 6 valence electrons in d-orbitals which can pair in presence of ligands to form low-spin complexes. Hence, Co3+ is more stable.
- Therefore, Co2+ easily gets oxidized to Co3+ in presence of ligands.


Thanks for the question, buddy..