The correct order of heat of formation of halogen acids is
(a) HI > HBr > HCl > HF (b) HF > HCl > HBr > HI
(c) HCl > HF > HBr > HI (d) HCl > HBr > HF > HI
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The boiling points of HF, HCl, HBr and HI
follow the order HF > HI > HBr > HCl.
HF is hydrogen bonded, thus has highest boiling point, and it is liquid at or below 19 °C. The remaining hydrogen halides are gaseous and their boiling points depend on the van der waal's forces. Larger the size (or molecular mass), greater are the van der Waal's forces, hence higher is the boiling point.
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