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An octahedral complex of Co3+ is diamagnetic. The hybridisation involved in the formation of the complex is:

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a
sp3d2
b
dsp2
c
d2sp3
d
dsp3d

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detailed solution

Correct option is C

The outer electronic configuration of  27Co3+ is (3d)6, i.e. free  27Co3+ ion ;

Since the octahedral complex of Co3+ is diamagnetic, it does not possess any unpaired electron. The configuration of Co3+ ion in the complex will be

Thus, Co3+ion in the complex involves d2sp3 hybridization.

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