Ammonia is a good complexing agent. Give reasons.
Or Ammonia acts as a ligand. Explain.

Explanation

Due to the presence of a lone pair of electrons on N, `NH_(3)` acts as a complexing agent (ligand). As a result, it combines with transition metal cations to form complexes. For example :
`{:(underset("Silver chloride")(AgCI) + 2 NH_(3),rarr,underset("Diamminesilver (I) chloride")([Ag(NH_(3))_(2)]CI)),(underset("Copper sulphate")(CuSO_(4))+4NH_(3),rarr,underset("Tetraamminecopper (II) sulphate")([Cu(NH_(3))_(4)]SO_(4))),(underset("Chromium chloride")(CrCI_(3))+6NH_(3),rarr,underset("Hexaamminechromium (III) chloride")([Cr(NH_(3))_(6)]CI_(3))):}`