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  4. The hybridisation of Ni centre in Ni[(PPh3)2Cl2] and [NiCl4]2, respectively are

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Q. The hybridisation of $Ni$ centre in $Ni[(PPh_3)_2Cl_2]$ and $[NiCl_4]^2$, respectively are

KVPYKVPY 2009Coordination Compounds

Solution:

The oxidation number of $Ni$ in both $[Ni(PPh_3)_2C1_2]$ and $[NiCl_4]^{2-}$ is $+2$.
The electronic configuration of $Ni (II)$ is $[Ar]3d^84s^0$.
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As $PPh_3$ is a strong ligand, so it forces the electrons to get pair up. $Ni (PPh_3)_2Cl_2$
image
As $Cl^{-}$ is not a strong ligand therefore pairing will not occurs.
image
Thus, the hybridisation of $Ni$ central atom in $Ni[(PPh_3 )_2Cl_2]$ and $[NiCl_4]^{2-}$ respectively are $dsp^2$ and $sp^3$.