Question

Hcl is gas while hf is liquid at room temp. . why??

Answer 1

HF is liquid because  HF molecule has strong intermolecular interactions than HCl 

also the HF is a smaller molecule so the HF molecules lie near than HCl so it is liquid 

Because of fluorine's high electronegativity, the hydrogen atom is almost completely stripped of electrons. It has a fairly large partial positive charge and is ripe for hydrogen bonding with the fluorine atoms in adjacent HF molecules.

Answer 2

HF has strong hydrogen bonding, so the force between molecules is stronger for this than in other hydrogen halides.

HCl doesn't form H-bonds with other HCl molecules.

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