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NEET CHEMISTRYCoordination CompoundsMedium

Question

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

A

Complex has symmetrical H-bonding.

B

Red complex has a tetrahedral geometry.

C

Dimethylglyoxime functions as a bidentate ligand.

D

Red complex has a square planar geometry.

Step-by-Step Solution

When an ethanol solution of dimethylglyoxime (DMG) is added to an ammoniacal solution of Ni(II), a rosy red precipitate of bis(dimethylglyoximato)nickel(II) is formed. In this complex, DMG acts as a bidentate ligand. The Ni(II) ion has a d8d^8 configuration, and in the presence of the strong field DMG ligand, the electrons pair up, resulting in dsp2dsp^2 hybridization. This gives the complex a square planar geometry, not tetrahedral. Furthermore, the complex is stabilized by symmetrical intramolecular hydrogen bonding between the oxygen and hydrogen atoms of the DMG ligands. Therefore, the statement that the red complex has a tetrahedral geometry is incorrect.

Exam Context & Concepts Covered

This question aligns with the NEET CHEMISTRY syllabus, specifically targeting concepts from Coordination Compounds. Mastering this topic is crucial for scoring well in the upcoming medical entrance examinations. Solving conceptually related problems will help you understand the nuances of these concepts and improve your problem-solving speed.

CHEMISTRYCoordination Compoundsprecipitateobtainedethanolsolutiondimethylglyoxime

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