The forces causing the vaporisation of liquid are derived from the Kinetic energy of translation of its molecules. The heat of vaporisation_________________?
Correct answer: A. Both B. & C.
- A. Both B. & C.
- B. Decreases with increasing pressure
- C. Becomes zero at the critical point
- D. Increases with pressure rise
Explanation
The heat of vaporisation decreases as pressure rises because the liquid and vapour become more similar near the critical point. At the critical point, the two phases merge and the heat of vaporisation becomes zero.
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