A chelating agent has two or more than two donor atoms to bind to a single metal ion. Which of the following is not a chelating agent?
(i) thiosulphate
(ii) oxalate
(iii) glycinato
(iv) ethane-1,2-diamine
Option (i) is the correct answer.
Explanation: Thiosulphate or is a monodentate ligand and not a chelating agent.