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Question

For the complex ion of [Co(NH3)6]3+:
(i) State the hybridisation of the complex.
(ii) State the magnetic nature of the complex.

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Solution

In [Co(NH3)6]3+ the oxidation state of cobalt is +3.Ammonia is a strong field ligand so it pair up 4 unpaired electron and free up 2 3d orbitals. These 3d orbitals are involved in hybridisation with one 4S and three 4P orbitals forming an inner orbital complex, so hybridisation of [Co(NH3)6]3+ is d2sp3

Since it has no unpaired electrons, [Co(NH3)6]3+ is diamagnetic.


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