1.

Account for the NH3 has higher boiling point than PH3.

Answer»

In ammonia (NH3), 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 (PH3), since the polarity of P-H bond is negligible as compared to N-H bond. This is due to lesser electronegativity of phosphorus as compared to nitrogen. Therefore, boiling point of ammonia is more than that of phosphine.



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