Question

Which of the following hydrides of the oxygen family shows the lowest boiling point?

• A. H2O
• B. H2S
• C. H2Se
• D. H2Te

Answer 1

Answer: (B)

H2S

Answer 2

H2O has highest boiling point due to H-bonding but down the group the boiling point increases with increasing molecular weight (as magnitude of van der Waal's force increases) and thus H2S has lowest boiling point amongst the hydrides of the oxygen family.