Under which condition is vapour pressure measured correctly?
Answer and explanation
Correct answer: In a closed vessel at equilibrium
The vapour pressure of a liquid is the pressure exerted by its vapour when the liquid and vapour are in dynamic equilibrium at a specified temperature. A closed vessel is needed so that vapour does not continuously escape. In an open vessel or strong wind, vapour is removed and equilibrium pressure is not established. A vacuum without liquid cannot have the vapour pressure of that liquid. Hence A is correct.
Frequently asked questions
What is the correct answer to this question?
In a closed vessel at equilibrium
Why is this the correct answer?
The vapour pressure of a liquid is the pressure exerted by its vapour when the liquid and vapour are in dynamic equilibrium at a specified temperature. A closed vessel is needed so that vapour does not continuously escape. In an open vessel or strong wind, vapour is removed and equilibrium pressure is not established. A vacuum without liquid cannot have the vapour pressure of that liquid. Hence A is correct.
Which subject and chapter does this question cover?
This is a Class 11 Chemistry question. Chapter: Equilibrium. Topic: Equilibrium in physical and chemical processes.
