Question

Which one of the following has lowest boiling point?

पर्याय

• H₂O

• H₂S

• H₂Se

• H₂Te

Answer 1

H₂S

Explanation:

Water (H₂O) has the highest boiling point among these hydrides due to strong intermolecular hydrogen bonding, which requires more energy to break. The other hydrides, H₂S, H₂Se, and H₂Te, do not exhibit hydrogen bonding and have boiling points that increase with increasing molecular size due to stronger van der Waals forces. Among them, H₂S has the smallest molecular size and weakest van der Waals forces; therefore, it has the lowest boiling point.