Among [Ni(CO) 4 ], [Ni(CN) 4 ] 2– , [NiCl 4 ] 2– species, the hybridisation states of the Ni atom are, respectively (At number of Ni = 28)
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Outermost electronic configuration of 
complex is 
and CO is a strong ligand thus electrons get paired up and shows 
hybridisation. Outermost electronic configuration of 
complex is 
and CN is a strong ligand thus electrons get paired up but one d orbital is empty and shows 
hybridisation. Outermost electronic configuration of 
complex is 
and Cl is a weak ligand thus electrons does not paired up and shows 
hybridisation.
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