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  4. Which one of the following arrangement of molecules is correct on the basis of their dipole moments?

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Q. Which one of the following arrangement of molecules is correct on the basis of their dipole moments?

NTA AbhyasNTA Abhyas 2022

Solution:

Both $NF_{3}$ and $NH_{3}$ have identical shape (pyramidal) and a lone pair of electron on nitrogen. Dipole moment of $NH_{3}$ is higher than $NF_{3}$ molecule as the orbital moment due to lone pair of electrons and the resultant dipole moment of 3 N-F bonds point in the opposite directions to that of lone pair of electrons.
$BF_{3}$ is a symmetrical molecule. It has zero dipole moment.
Solution