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Question:

Red precipitate is obtained when ethanol solution of dimethylglyoxime is added to ammoniacal Ni(II). Which of the following statements is not true?

Complex has symmetrical H-bonding.

Red complex has a square planar geometry.

Red complex has a tetrahedral geometry.

Dimethylglyoxime functions as bidentate ligand.

Solution:

Ni+2 + 2dmg- → [Ni(dmg)2]

The reaction shows that Ni2+ reacts with two molecules of dimethylglyoxime (dmg) to form a complex [Ni(dmg)2]. The complex formed is a square planar complex with symmetrical hydrogen bonding between the two dimethylglyoxime ligands. Therefore, the statement 'Red complex has a tetrahedral geometry' is not true.