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Ni(28): [Ar]3d8 4s2

1. CO is a strong field ligand and causes pairing of electrons.
2. CO causes pairing of electrons and configuration would be sp3.
3. CO causes pairing of electrons and configuration would be sp3 hybridisation.
4. CO causes pairing of electrons and configuration would be diamagnetic.

Correct answer: CO is a strong field ligand and causes pairing of electrons.

Solution

CO is a strong field ligand that causes the pairing of electrons in the 3d orbital of Ni, leading to a low-spin complex. This aligns with the crystal field theory.

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