The electronegativity difference berween N and F is greater than that between N and H yet the dipole moment of NH 3 (1.5D) is larger than that of NF 3 (0.2 D). This is because

in NH 3 the atomic dipole and bond dipole are in the same direction whereas in NF 3 these are in opposite directions

in NH 3 the atomic dipole and bond dipole are in the opposite directions whereas in NF 3 these are in the same direction

in NH 3 as well as in NF 3 the atomic dipole and bond dipole are in the same direction

in NH 3 as well as in NF 3 the atomic dipole and bond dipole are in opposite directions.

Chemical Bonding and Molecular Structure PYQ — NEET 2006 · Q104 with Solution

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Correct answer: C

The dipole moment of NF₃ is 0.24 D and of NH₃ is 1.48 D. In NF₃, the dipole moment vector are aligned in opposite direction to that of the dipole moment vector of lone pair on N–atom which partly cancel out. On the other hand, N–H bonds in NH₃ are in the same direction of dipole moment of the lone pair on N-atom which adds up the new resultant dipole moment.

AIPMT 2006 Chemistry - Chemical Bonding and Molecular Structure Question 42 English Explanation

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