Which of the following is not a chelating agent?

Thiosulphato

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Oxalato

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Glycinato

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Ethylene diamine

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Solution

The correct option is D Thiosulphato
Oxalato, glycinato and ethylene diamine are large ligands and they can form rings because they all are bidentate ligands. So, they all are also chelating ligands. Thiosulphato is a monodentate ligand and hence, cannot form chelate rings. So, it is not a chelating ligand.

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