Answer:
In ammonia \[(N{{H}_{3}}),\] the
molecules are involved in the intermolecular hydrogen bonding on account of the
polarity of N-H bonds. But the same is not possible in molecules of phosphine \[(P{{H}_{3}})\]
since the polarity of P-H bond is negligible as compared to N-H bond. This is
due to lesser electro negativity of phosphorus (2.1) as compared to nitrogen
(3.0). Therefore, boiling point of ammonia is more than that of phosphine.
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