In a closed vessel at liquid-vapour equilibrium, which two processes occur at equal rates?
Answer and explanation
Correct answer: Evaporation and condensation
Liquid molecules continuously escape into the vapour phase; this is evaporation. Vapour molecules simultaneously return to the liquid; this is condensation. At dynamic equilibrium, the forward and reverse rates are equal, so macroscopic amounts remain constant. The other pairs describe different processes and are not the liquid-vapour equilibrium pair.
Frequently asked questions
What is the correct answer to this question?
Evaporation and condensation
Why is this the correct answer?
Liquid molecules continuously escape into the vapour phase; this is evaporation. Vapour molecules simultaneously return to the liquid; this is condensation. At dynamic equilibrium, the forward and reverse rates are equal, so macroscopic amounts remain constant. The other pairs describe different processes and are not the liquid-vapour equilibrium pair.
Which subject and chapter does this question cover?
This is a Class 11 Chemistry question. Chapter: Equilibrium. Topic: Equilibrium in physical and chemical processes.
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