Question

Which of the follwing compounds which have minimum boiling point h2o,h2s?

Answer 1

In H2O and H2S,
Oxygen and Sulphur are the central atoms. Oxygen is more electronegative and hence it can form more number of intermolecular H bonding with other water molecules than Sulphur in H2S.
So,
More the number of H bondings, more will be the boiling point.

So,
due to more electronegativity of oxygen in H2O than Sulphur in H2S,
H2O has higher boiling point than H2S.

I hope its helpful.