Question

Incorrect statement about DMG.
A. It is tetradentate ligand.
B. Chelating agent
C. Dioxime of diacetyl
D. In gravimetric determination of Ni is used

Answer 1

DMG means Dimethylglyoxime. Dimethylglyoxime is a ligand having a capability to bind with metals. Ligands have a capability to form complexes with metals. DMG is used in the precious metal refining process.

Complete step by step solution:
- In the question it is given that to find the incorrect statement regarding DMG among the given options.
- Coming to given options, option A, It is tetradentate ligand. It is incorrect because DMG is bidentate ligand means it can form two bonds with metal. Means DMG has two donor atoms in it.
- Coming to option B, Chelating agent. It is true because DMG forms chelate or complex with metals when it reacts with them.
- Coming to option C, Dioxime of diacetyl. It is also correct because it contains diacetyl in its structure.
- The structure of DMG is as follows.

- Coming to option D, In gravimetric determination of Ni is used. It is also correct because in gravimetric analysis to determine the amount of nickel, DMG is going to be used because it forms a complex with nickel.
- Therefore DMG is not a tetradentate ligand. So, the correct answer is “Option A”.

Note: DMG forms complex or chelates with Nickel, Palladium, and cobalt metals. The molecular formula of dimethylglyoxime is ${{C}_{4}}{{H}_{8}}{{N}_{2}}{{O}_{2}}$ . DMG is less soluble in water but highly soluble in a solution of sodium hydroxide and methanol.