What type of hybridisation is associated with N in NH₃? What is the expected bond angle in NH₃?

NH₃ is Sp₃ hybirdisation as there are three bonding pairs of electrons and one non bonding pair. The bond angle in a molecule of ammonia are 107^o, a value very close to tetrahedral angle (109^o.5^').
The central atom has both shared and unshared electron pairs. The shape of ammonia molecule (NH₃) is trigonal pyramid.