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Que.: What are Chelate compounds and Chelation?

Ans.:

Chelate, any of a class of coordination or complex compounds consisting of a central metal atom attached to a large molecule, called a ligand in a cyclic or ring structure. An example of a chelate ring occurs in the ethylenediamine-cadmium complex.

Chelation: It is the formation or presence of two or more separate coordinating bonds between a polydentate (multiple bonded) ligand and a single central atom.