NiCl 2 { P ( C 2 H 5 ) 2 ( C 6 H 5 ) } 2 exhibits temperature depend-ent magnetic behaviour (paramagnetic/diamagnetic). The coordination geometries of Ni 2 + in the paramagnetic and diam

Question

NiCl 2 ​ { P ( C 2 ​ H 5 ​ ) 2 ​ ( C 6 ​ H 5 ​ ) } 2 ​ exhibits temperature depend-ent magnetic behaviour (paramagnetic/diamagnetic). The coordination geometries of Ni 2 + in the paramagnetic and diamagnetic states are respectively

TestHub · Accepted Answer

In both states (paramagnetic and diamagnetic) of the given complex, $Ni$ exists as $Ni^{2 +}$ whose electronic configuration is $[Ar] 3 d^{8} 4 s^{0}$ .
In the above paramagnetic state the geometry of the complex is $s p^{3}$ giving tetrahedral geometry. The diamagnetic state is achieved by pairing of electrons in $3 d$ orbital.
Thus, the geometry of the complex will be $d s p^{2}$ giving square planar geometry.

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