The bond angles in NH 3 , NF 3 and NCl 3 are in the order :

Step-by-step solution

Comparison of NH 3 and NF 3 : Since N is more electronegative than hydrogen, shared pair of electrons of the N - H bond spent more time with nitrogen ( closer to nitrogen) giving a greater bond pair repulsion. On the other hand fluorine is more electronegative than nitrogen, shared pair of electrons of N - F bond spent more times with fluorine ( closer to fluorine ) giving less bond pair repulsion as compared to N - H bond. Although bond pair bond pair repulsion in both cases are less than lone pair - bond repulsio