The geometry and magnetic behaviour of the complex [Ni(CO)4] are 

(1) square planar geometry and diamagnetic 

(2) tetrahedral geometry and diamagnetic 

(3) square planar geometry and paramagnetic 

(4) tetrahedral geometry and paramagnetic

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2 Answers

Geometry: Tetrahedral geometry

Magnetic behaviour: Diamagnetic

Ni(28)= [Ar]3d84s2

Unpaired electrons= 0

Therefore, complex is diamagnetic

Since CO is a strong field ligand, for 4CO ligands hybridisation would be sp3 and thus geometry will be tetrahedral.

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tedrahedral and diamagnetic

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