What is ligand? Explain classification of ligand with illustration.

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Solution

A ligand is an ion, a molecule or a compound that is capable of donating a pair of electrons to a central atom.

Classification:
Unidentate ligands contain only one donor atom. Eg. $C l^{-}$
Bidentate ligands contain two donor atoms. Eg. Ethylenediamine
Tridentate ligands contain three donor atoms. Eg. Diethyltriamine.
Hexadentate ligands have six donor atoms. Eg. EDTA
Chelating ligands are those that produce a ring like structure called chelate.

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