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B
Oxalate
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C
Cyanide
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D
Ammonia
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Solution
The correct option is A Oxalate In chelation, ring formation occurs because two atoms from the same ligand coordinate with the metal atom. This cannot happen if the ligand is monodentate.
Oxalate is a bidentate ligand hence it forms a chelate. It can coordinate with both of its negatively charged O atoms.
Acetate, cyanide and ammonia are monodentate ligands. They do not form chelates.