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Question

At a particular temperature if vapour pressure of pure liquid A is 100 mm Hg and that of pure liquid B is 300 mm Hg.
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.
  1. If a liquid has a high vapour pressure at a particular temperature, it means that its molecules can escape easily from the surface
  2. The liquid with the higher vapour pressure at a particular temperature is the one with the lower boiling point.

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