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The boiling points of some group 7A hydrides are tabulated below.
gas b.p. (°C)
NH3 –33
PH3 –88
AsH3 –62
Which intermolecular force or bond is responsible for the high boiling point of NH3 relative to PH3 and AsH3?A) Dipole/induced dipole force B) Covalent bonding C) Dipole-dipole force D) Induced dipole/induced dipole force E) Hydrogen bonding

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Willchemistry

hey there!:

In the case of ammonia, the hydrogen bond is formed using the lone pair present in nitrogen and the hydrogen having δ+ charge (due to bonding with electronegative N) of another ammonia molecule. Thus the inter molecular attraction increases which in turn increases the boiling point .

Option B is the correct answer.

Hope this helps!