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Q.
$ HCl $ is a gas but HF is a low boiling liquid. This is because
MGIMS WardhaMGIMS Wardha 2010
Solution:
HF is a low boiling liquid due to the presence of hydrogen bonding in the molecules. Due to hydrogen bonding in HF molecules it exist as associated molecules $ {{(HF)}_{n}} $ . $ ---H-F--HF---\text{ }HF---\text{ }HF--- $ or $ {{(HF)}_{n}} $ $ HCl $ is a gas due to absence of hydrogen bonding in the molecules. Hydrogen bond is formed between H-atom and most electronegative atom (like, N, O and F).