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Q.

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

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a

H2Se

b

H2S

c

H2O

d

H2Te

answer is B.

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Detailed Solution

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. 

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