previous | 7 of 10 I n Why does NHs not follow the trend in boiling points? Exer
ID: 691973 • Letter: P
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previous | 7 of 10 I n Why does NHs not follow the trend in boiling points? Exercise 11.116 The atomic mass of nitrogen is smaller than that of other pnictogens The boiling points for the series of pnictogen hydrides are plotted below. The dipole moments of these five molecules decrease along the series (e.g, NHs >PH AsH>SbHs BiH3) There are very strong dipole induced dipole forces in ammonia. O Ammonia has only dipole-dipole interactions Figure 1) Ammonia is capable of hydrogen bonding in addition to dipole-dipole interactions. Submit My Answers Give Up Part B Figure 1 of 1 The dipole moments decrease across the series PH> AsH>SbH >BiHg. Why do the boiling points increase? 300 BiH, Check all that apply 280 2 260 NH, n The electron clouds of the molecules 240 220 200 180 60 become smaller along the series The larger numbers of electrons are more polarizable, leading to greater dispersion forces AsH PH, The electron clouds of the molecules become larger along the series Atomic number of pnictogen The smaller numbers of electrons are more polarizable, leading to greater dispersion forcesExplanation / Answer
A.
This anomalous behaviour of ammonia is due its hydrogen bonding.
B.
The larger no. of electrons are more polarizable and hence the dispersion forces ,which hold them together more strongly down the group.
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