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JEE Main202122 Jul 2021Morning ShiftChemistryCoordination CompoundsActual

The total number of unpaired electrons present in [ Co ( NH ₃ )₆ ] Cl ₂ and [ Co ( NH ₃ )₆ ] Cl ₃ is

Correct answer

1

Step-by-step solution

Co NH 3 6 Cl 2 Co 2 + : [ Ar ]   3 d 7 4   s 0 4 p 0 For strong field ligand and d 7 configuration: t 2 g 2 , 2 , 2   e g 1 , 0 Total 1 unpaired electron is present. Co NH 3 6 Cl 3 Co 3 + : [ Ar ] 3   d 6 4   s 0 4 p 0 The hybridisation of the complex is d 2 sp 3 hybridisation. NH 3 acts as strong field ligand, because Δ 0 > P . E . . So here all electrons becomes paired.

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