MEDIUMMCQ SINGLEJEE Mains ChemistryInorganic ChemistryCoordination compoundsValence Bond Theory

Amongst[ Ni (CO)4], [Ni (CN)4]2– and [NiCl4]2

A.[Ni (CO)4] and [NiCl4]2– are diamagnetic

B.[NiCl4]2– and [Ni (CN)4]2– are diamagnetic and

C.[Ni (CO)4] and [Ni (CN)4]2– are diamagnetic and✓ Correct

D.[Ni (CO)4] is diamagnetic and [NiCl4]2– and

Explanation

4 1.[Ni(CO) ],Ni=0 8 2 2- 4 +2 8 2- 4 +2 8 Ni=[Ar]3d 4s 2.[Ni(CN) ] ,Ni=+2 Ni =[Ar]3d 3.[NiCl ] ,Ni=+2 Ni =[Ar]3d CO and CN- are strong filed ligands Hence, both the complexes are diamagnetic in nature whereas Cl- is a weak field ligand, Hence, this complex is paramagnetic. Hence, the correct answer is option (c)

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