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  4. Least volatile hydrogen halide is

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Q. Least volatile hydrogen halide is

AFMCAFMC 2010The p-Block Elements - Part2

Solution:

As the size of halogen atom increases, the boiling point of hydrogen halides increases. However, $HF$ has the highest boiling point among the hydrogen halides because of $H$-bonding and
Boiling point $\alpha \frac{1}{\text { volatility }}$
Thus, $HF$ is least volatile among hydrogen halides.