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NEET levelSingle correct optionDifficulty 1 of 3cc062

The complex $[Ni (CO) X_{4}]$ is

Adiamagnetic and square planar
Bdiamagnetic and tetrahedral
Cparamagnetic and square planar
Dparamagnetic and tetrahedral

Answer: B

Ni is in the 0 state, with an effective

3 d^{10}

configuration, and CO is a strong-field ligand. With

d^{10}

there are no unpaired electrons, and four ligands around a

d^{10}

centre use

s p^{3}

hybrid orbitals, giving a tetrahedral, diamagnetic complex.

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