`NiCI_(2)` in the presence of dimethy1 glyoxime` (DMG)` gives a complex which precipitates in the presence of `NH_(4)OH` giving a bright red colour .
(a) Draw its structure and show `H` bonding
(b) Give the oxidation state of Ni and its hybridisation
(c ) Predict whether it is paramagnetic or dimagnetic .

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