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

  1. A

    sp3d2

  2. B

    dsp2

  3. C

    d2sp3

  4. D

    dsp3d

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    Solution:

    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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