At a particular temperature if vapour pressure of pure liquid A is 100mmHg and that of pure liquid B is 300mmHg.
Then choose the correct option:
A
Liquid A has lower boiling point under similar conditions.
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B
Liquid B has lower boiling point under similar conditions.
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C
Both liquids have same boiling point under similar conditions.
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D
None of the above
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Solution
The correct option is B Liquid B has lower boiling point under similar conditions. At a particular temperature,
When vapour Pressure is equal to atmospheric pressure, boiling point is reached.
If a liquid has a high vapour pressure at a particular temperature, it means that its molecules can escape easily from the surface
The liquid with the higher vapour pressure at a particular temperature is the one with the lower boiling point.