Question

A liquid is kept in a closed vessel. If a glass plate (negligible mass) with a small hole is kept on top of the liquid surface, then the vapour pressure of the liquid in the vessel is :

• A. more than what would be if the glass plate were removed
• B. same as what would be if the glass plate were removed
• C. less than what would be if the glass plate were removed
• D. cannot be predicted

Answer 1

The correct option is B same as what would be if the glass plate were removed

Option (B) is correct.
The vapour pressure of the liquid in the vessel is same as what would be if the glass plate were removed. Vapour pressure is characteristic property of a solvent at a temperature.