The electronegativity difference between N and F is greater than that between N and H, yet the dipole moment of NH₃ (1.5 D) is larger than that or NF₃ (0.2 D). This is because :

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In NH₃ as well as in NF₃ the atomic dipole and bond dipole are in the same direction

In NH₃ the atomic dipole and bond dipole are in the opposite directions, whereas in NF₃ these are in the same direction

In NH₃ as well as NF₃ the atomic dipole and bond dipole are in opposite directions

In NH₃ the atomic dipole and bond dipole are in the same direction, whereas in NF₃ these are in opposite directions

answer is A.

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Detailed Solution

In NH₃ the atomic dipole and bond dipole are in the same direction and are added up whereas in NF₃ these are in opposite directions and decreases dipole moment. It has been shown in the following figure.

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