Question

Which amongst the following has a polar covalent bond?

• A. $NaCl$
• B. $N{H}_3$
• C. $O_2$
• D. $CaO$

Answer 1

The correct option is B $N{H}_3$

Ammonia is polar, because in addition to the hydrogen ions, the nitrogen also has a lone pair of electrons that cause the molecule to form a triangular-pyramid shape. Because the nitrogen ion is more electronegative than the hydrogen ions, the ammonia molecule is polar with a slight negative charge in the direction of the nitrogen ion.