`NiCl_(2)` in the presence of dimethyl glyoxime (DMG) gives a complex with precipitates in the presence of `NH_(4)OH`, giving a bright red colour.
(i) Draw its structure and show H- bonding
(ii) Give oxidation state of Ni and its hybridisation .
(iii) Predict whether it is paramagnetic or diamagnetic .

Explanation

`NiCI_(2)` in the presence of dimethyl glyoxime `(DMG)` give a complex which precipitates in the presence of `NH_(4)OH` giving a bright-red colour The structure of the complex is The oxidation state of Ni in this compound is +2 The ligand is strong so it causes pairing Therefore it the shape `dsp^(2)` hybridisation The oxidation number =28
`Ni =[Ar] 3d^(8) 4s^(2)`
`Ni^(2+) =[Ar] 3d^(8)`
After pairing `dsp^(2)` hybridisation occurs There are no unpaired electrons, so the complex diamagnetic