Chemistry - CHEMICAL BONDING Question with Solution | TestHub

Statement-1 is correct. The dipole moment of ${\text{NH}}_3$ is approximately $1.47\text{ D}$, while that of ${\text{NF}}_3$ is approximately $0.23\text{ D}$. Statement-2 is also correct and explains Statement-1. In ${\text{NH}}_3$, nitrogen is more electronegative than hydrogen, so the bond dipoles are directed towards nitrogen, adding to the lone pair dipole moment. In ${\text{NF}}_3$, fluorine is more electronegative than nitrogen, so the bond dipoles are directed towards fluorine, which is opposite to the direction of the lone pair dipole. This leads to a partial cancellation of dipoles, resulting in a much lower net dipole moment for ${\text{NF}}_3$.