MEDIUMMCQ SINGLEJEE Mains ChemistryInorganic ChemistryCoordination compoundsPrevious Year Questions
The geometry and magnetic behaviour of the complex [Ni(CO)4] are (NEET 2018)
A.tetrahedral geometry and diamagnetic✓ Correct
B.square planar geometry and paramagnetic
C.square planar geometry and diamagnetic
D.tetrahedral geometry and paramagnetic
Explanation
In Ni(CO4)4, Ni is in the zero-oxidation state i.e., it has a configuration of [Ar]3d84s2. CO is a strong field ligand and it causes the pairing of unpaired 3d electrons. It also causes the 4s electrons to shift to the 3d orbital, thereby giving rise to sp3 hybridization and Hence, it has a tetrahedral shape. Since no unpaired electrons are present in this case, [Ni(CO)4] is diamagnetic. Therefore, the first option is correct.
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