A) \[HF\]bond is strong
B) \[HF\]bond is weak
C) molecules aggregate because of hydrogen bonding
D) HF is a weak acid
Correct Answer: C
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).
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