[Co(NH3)6]3+ Co3+ (strong field ligand) ⇒3d6(t2g6,eg0) , Hybridisation : d2sp3 Inner obital complex(spin paired complex) Pairing will take place. [CoF6]3− Co3+ (weak field ligand) ⇒3d6(t2g4,eg2) Hybridisation : sp3d2 Outer orbital complex (spin free complex) no pairing will take place