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  4. The dipole moments of the given species are such that

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Q. The dipole moments of the given species are such that

NTA AbhyasNTA Abhyas 2020Chemical Bonding and Molecular Structure

Solution:

The dipole moments of the given species are as follows

$NH_{3}>NF_{3}>BF_{3}$

$BF_{3}$ is a planar molecule, so it has zero dipole moment. $NH_{3}$ has more dipole moment than $NF_{3}$ . The resultant dipole moment of three $N-H$ bonds and dipole moment due to lone pair of electrons are acting in the same direction, but in case of $NF_{3}$ the resultant dipole moment of the three $N-F$ bonds is acting opposite to the direction of dipole moment due to lone pair of electrons.