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  4. Of the following hydrides, which one has the lowest boiling point?

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Q. Of the following hydrides, which one has the lowest boiling point?

JIPMERJIPMER 1998

Solution:

Hydrogen chloride (HCl) has the lowest boiling point among halogen acids. HF has abnormally high boiling point (20∘C) due to hydrogen bonding while other are gases at room temperature.