Q. The geometry and magnetic behaviour of the complex $\left[\right.Ni\left(\right.CO\left(\left.\right)_{4}\left]\right.$ are

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Square planar geometry and paramagnetic

Tetrahedral geometry and diamagnetic

Square planar geometry and diamagnetic

Tetrahedral geometry and paramagnetic

Solution:

$Ni\left(\right.28\left.\right):\left[\right.Ar\left]\right.3d^{8}4s^{2}$
As CO is a strong field ligand so configuration would be

n=0(no unpaired electron)
For, four ‘CO’-ligands hybridisation would be $sp^{3}$ and thus the complex would be diamagnetic and of tetrahedral geometry as follows.

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