Oxidation state of cobalt = +3 Oxidation state of Ni = +2 Electronic configuration of cobalt = d 6 Electronic configuration of nickel = d 8 NH3 being a strong field ligand causes the pairing Therefore, Ni can undergo d 2 sp 3 hybridization Hence, it is an inner orbital complex If NH3 causes the pairing, then only one 3d orbital is empty Thus, it cannot undergo d 2 sp 3hybridization Therefore, it undergoes sp 3 d 2 hybridization Hence, it forms an outer orbital complex

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Oxidation state of cobalt = +3	Oxidation state of Ni = +2
Electronic configuration of cobalt = d ⁶	Electronic configuration of nickel = d ⁸
NH₃ being a strong field ligand causes the pairing. Therefore, Ni can undergo d ² sp ³ hybridization. Hence, it is an inner orbital complex.	If NH₃ causes the pairing, then only one 3d orbital is empty. Thus, it cannot undergo d ² sp ³hybridization. Therefore, it undergoes sp ³ d ² hybridization. Hence, it forms an outer orbital complex.

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