1. Tardigrade
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  3. Chemistry
  4. Among [Ni(CO)4], [Ni(CN)4]2- , [NiCl4]2- species, the hybridisation states of the Ni atom are, respectively (At. no. of Ni = 28)

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Q. Among $[Ni(CO)_4], [Ni(CN)_4]^{2-} , [NiCl_4]^{2-}$ species, the hybridisation states of the $Ni$ atom are, respectively (At. no. of $Ni = 28$)

AIPMTAIPMT 2004Coordination Compounds

Solution:

Outermost electronic configuration of $\left[ Ni ( CO )_{4}\right]$ complex is $3 d ^{8}, 4 s ^{2}$ and $CO$ is a strong ligand thus electrons get paired up and shows $sp ^{3}$ hybridisation.
Outermost electronic configuration of $\left[ Ni ( CN )_{4}\right]^{2-}$ complex is $3 d ^{8}$ and $CN$ is a strong ligand thus electrons get paired up but one d orbital is empty and shows dsp ${ }^{2}$ hybridisation.
Outermost electronic configuration of $\left[ Ni ( Cl )_{4}\right]^{2-}$ complex is $3 d ^{8}, 4 s ^{2}$ and $Cl$ is a weak ligand thus electrons does not paired up and shows $sp ^{3}$ hybridisation.