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  4. Which of the following has the maximum vapour pressure?

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Q. Which of the following has the maximum vapour pressure?

AMUAMU 2018The p-Block Elements - Part2

Solution:

$HCl$ is the most volatile compound among all hydrogen halides. The volatility of a compound is related to its high vapour pressure at ordinary temperature. $HF$ due to hydrogen bonding is least volatile, as the molecular weight increases, intermolecular forces increases due to van der Waals' force of attraction. Thus, $HI$ is liquid and $HCl$ is gas with maximum vapour pressure among all hydrogen halides