_is colorless volatile liquid at room temperature.
Correct answer: B. HF
- A. HCl
- B. HF
- C. HI
- D. HBr
Explanation
Due to the small size and high electronegativity of Fluorine, it does very strong Hydrogen Bonding in an HF molecule. So it's stable enough to exist as a colorless fuming liquid at 293°K boiling point. Hence, HF is a colorless fuming liquid while HCl, HBr, and HI are gases.
This question appeared on the UHS MDCAT 2008 paper, which you can sit online with every answer explained.
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About Hydrogen Bonding
Hydrogen bonding is the strong attraction between hydrogen attached to nitrogen, oxygen or fluorine and an electronegative atom in the same or another molecule. It explains unusual boiling points, viscosity, surface tension, water's properties and the difference between intermolecular and intramolecular hydrogen bonding.
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