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[NiCl4]^(2-) is paramagnetic while Ni(CO...

`[NiCl_4]^(2-)` is paramagnetic while `Ni(CO)_4` is diamagnetic though both are tetrahedral.Why?

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In .Ni(CO)_4^*, Ni. is in zero oxidation state where.as in .[NiCl_4]_1^--. it is.in .+2. oxidation state. In the presence of CO ligand, the unpaired d .electrons of Ni.pair up but .Cl. - being a weak ligand is unable to pair up the unpaired electrons.
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