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The boiling point of a liquid is the temperature at which its vapor pressure equals:
ATwice the solute pressure
BHalf the osmotic pressure
CAmbient atmospheric pressure
DExactly zero pressure
Answer & Solution
Correct answer: C. Ambient atmospheric pressure
1. Boiling is defined by a pressure match, not a fixed temperature.
2. The boiling point of a liquid is a temperature defined by its vapor pressure.
3. It is the temperature at which vapor pressure equals ambient atmospheric pressure.
4. Adding solute lowers vapor pressure, so the boiling point rises.
_Source: OpenStax Chemistry 2e (CC BY 4.0), Ch 11 'Solutions and Colloids', sections 11.1-11.5_
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