When dimethyl glyoxime is added to the aqueous solution of nickel(II) chloride in presence of dilute ammonia solution, a bright red coloured precipitate is obtained.
Text Solution
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Ni 2+ + 2dmg 
[Ni(dmg) 2 ] ↓ (bright red).
It acquires stability through chelation and intra molecular H-bonding.
In [Ni(dmg) 2 ] the nickel is in +2 oxidaiton state and to have square planar geometry because of chelation the pairing of electrons takes place. So
[Ni(dmg) 2 ] 
As all electrons are paired, so complex is diamagnetic. Nickel with coordination number four will have the structure as given below.
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