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Compare the polarity nature of NH_(3) and NF_(3). |
Answer» Solution :Both `NH_(3) and NF_(3)` have PYRAMIDAL sphaes with a long pair of electrons on NITROGEN atom Fluorine is more electronegatvie than nitrogen. Dipole moment of N-II bond is less than that of N-f bond. Inspite of this the dipole moment of `NH_(3)(4.9xx10^(30) cm)` is greater than that of `NH(0.8xx10^(-30)` cm). This can be explained by observing the structure of `NH_(3) and NF_(3)`. The dipole due to lone pair of electrons is acting in the same direction as the resultant dipole moment of N-H bonds. The two actions put together result in ammonia having higher dipole moment.  In `NF_(3)` the direction of ORBITAL dipole moment due to lone pari is opposite to the direction of resultant dipole moment of `3N-F` bonds. The magnitudes of dipole MOMENTS are not same. As a result the net dipole omement of `NF_(3)` will decreases. |
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