(a) [Fe(CN)6]3 - hexacyanoferrate (III) ion hybridization −d2sp3(b) Ambidentate ligand can bond through different atoms to form different coordination compounds. e.g. NO2−can bind to the central atom or ion at either the nitrogen atom or one of the oxygen atom.

Chelating ligand : If the ligands with two or more electron donor groups positioned in such a way that they form five or six membered ring with central metal ion are called chelating ligands. e.g. ethane -1, 2-diamine (en)