why NH3 has higher boiling point than PH3 even though it is lighter?

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Solution

N is much more electronegative atom than H-atom While that of P is close to hydrogen. Therefore NH₃ molecules undergo inter-molecular hdrogen bonding while the occurence of this type of hydrogen -bonding is absent in PH₃. It is because of this bonding that (NH₃)_xclusters are formed . So, in order to break H-bonds holding NH₃ molecules in their cluster more heat energy is required and hence boiling points of NH₃ is higher than that of PH₃.

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