On which factors does the vapour pressure of a substance depends on?
Correct answer: D. Both B and C
- A. Physical state of matter
- B. Intermolecular forces
- C. Temperature
- D. Both B and C
Explanation
The vapour pressure depends on two factors:1. Nature of liquid: The nature of liquid is explained on the basis of its intermolecular forces; Greater the magnitude of intermolecular forces, the lesser will be the vapour pressure. 2. Effect of temperature: Vapour pressur is directly proportional to temperature. This is because on increasing the temperature, the kinetic energy of the molecule increases.
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About Evaporation, Boiling Point and Vapour Pressure
Evaporation is the escape of higher-energy molecules from a liquid surface, while vapour pressure is the pressure exerted by vapour in equilibrium with that liquid. The topic distinguishes evaporation from boiling and relates both to temperature, intermolecular forces, surface area, atmospheric pressure and the boiling point.
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