Question

Ammonia is a good complexing agent. Explain with an example.

Answer 1

Ammonia is a good complexing agent because it is a good lewis base. The lone pair of electrons on N atom can be easily donated to central metal.
For example, in the complex $\left[Ag\right(N{H}_3{)}_2]Cl$, two ammonia ligands form a complex with Ag by donating lone pair of electrons on N atom to form coordinate bond.