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The complex ion [Co(NH3)6]3+ is formed by sp3d2 hybridisation. Hence, the ion should possess

1. Octahedral geometry
2. Tetrahedral geometry
3. Square planar geometry
4. Tetragonal geometry

Correct answer: Octahedral geometry

Solution

The sp3d2 hybridisation corresponds to an octahedral geometry, as six hybrid orbitals are arranged symmetrically around the central atom.

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