Which of the following complexes is diamagnet | vedclass

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(A) In $Ni(CO)_4$,the oxidation state of $Ni$ is $0$. The electronic configuration of $Ni$ is $[Ar] 3d^8 4s^2$.Since $CO$ is a strong field ligand,it

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$Ni(CO)_4$

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(A) In $Ni(CO)_4$,the oxidation state of $Ni$ is $0$. The electronic configuration of $Ni$ is $[Ar] 3d^8 4s^2$.Since $CO$ is a strong field ligand,it causes the pairing of electrons in the $3d$ and $4s$ orbitals,resulting in a $sp^3$ hybridized state with no unpaired electrons.Therefore,$Ni(CO)_4$ is diamagnetic.In contrast,$Ni(Cl)_4^{2-}$ and $Ni(Br)_4^{2-}$ involve weak field ligands ($Cl^-$ and $Br^-$),leading to $sp^3$ hybridization with two unpaired electrons,making them paramagnetic.

Which of the following complexes is diamagnetic?

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