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  4. Assertion: Dipole moment of NH3 is greater than that of NF3. Reason: Nitrogen is more electronegative than fluorine.

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Q. Assertion : Dipole moment of $NH_3$ is greater than that of $NF_3$.
Reason : Nitrogen is more electronegative than fluorine.

Chemical Bonding and Molecular Structure

Solution:

In case of $NH_3$, the orbital dipole due to lone pair is in the same direction as the resultant dipole moment of the three $ N - H$ bonds whereas in $NF_3$ the orbital dipole is in the direction opposite to the resultant dipole moment of three $N— F$ bonds which decreases the dipole moment of $NF_3$ as shown below:
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