1.

NiCl_(2) {P(C_(2)H_(5))_(2)(C_(6)H_(5))}_(2) exhibits temperature dependent magnetic behaviour (paramagnetic/diamagnetic). The coordination geometries of Ni^(2+) in the paramagnetic and diamagnetic states are respectively

Answer»

tetrahedral and tetrahedral
square planar and square planar
tetrahedral and square planar
square planar and tetrahedral

Solution :`[NiCl_(2){P(C_(2)H_(5))_(2)(C_(6)H_(5))}_(2)]`
contains `Ni^(2+)` having the electronic configuration as under :

In the high spin state, it is paramagnetic with `sp^(3)` hybridization giving tetrahedral geometry. In the LOW spin state (unpaired electrons PAIR up), it is diamagnetic with `dsp^(2)` hybridization giving square planar geometry.


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