Solve this:
Q.80. Which are non-polar molecules?
I : $NC{l}_3$; II: $S{O}_3$; III : $PC{l}_5$
(1) I only
(2) II only
(3) I and II only
(4) II and III only

Dear student,


As evident from the figure in SO₃ all bond moments gets cancelled hence it is non polar. In NCl₃ , all bond moments do not get cancelled hence it is polar and in PCl₅ all bond moments get cancelled hence it is non polar.
Hence the answer is (4).

Hope it helps
Regards