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

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$H_{2} Se$

$H_{2} S$

$H_{2} O$

$H_{2} Te$

answer is B.

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Detailed Solution

$H_{2} O$ 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 $H_{2} S$ has lowest boiling point amongst the hydrides of the oxygen family.

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