Question

Although $F$ is more electronegative than $H$, the resultant dipole moment of $NH_{3}$ is much more than that of $NF_{3}$. It can be explained as

• A. the lone pair of nitrogen opposes the dipole moment of $NF_{3}$ while it is added to the dipole moment of $NH_{3}$
• B. all the dipoles of $NF_{3}$ are in same direction
• C. all the dipoles of $NH_{3}$ are in opposite direction
• D. $NH_{3}$ has a regular geometry while $NF_{3}$ has irregular geometry which makes dipole moment of $NH_{3}$ more than $NF_{3}$.

Answer 1

Answer: (A)

Correct answer is (a) the lone pair of nitrogen opposes the dipole moment of $NF_{3}$ while it is added to the dipole moment of $NH_{3}$