Answer :
Electronic configuration of Co: [Ar]3d74s2
Electronic configuration of Co3+ : [Ar]3d64s0
Since NH3 is a weak field ligand no pairing up of electrons occurs. Hence forms a high spin complex.
Since there are 6 ligands the hybridization will be sp3d2 as the inner d-orbitals are not vacant.
Shape of sp3d2 will be octahedral.
IUPAC name: Hexaamminecobalt(III)ion
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