Question

Account for the following :

H₂S has lower boiling point than H₂O.

Answer 1

H₂S molecules are involved in weaker hydrogen bonding than H₂O molecules. This is because of the lower electronegativity of sulphur than oxygen. So, less energy is required to break the hydrogen bonds in H₂S. Thus, the boiling point of H₂S is lower than that of H₂O.