wiz-icon
MyQuestionIcon
MyQuestionIcon
1
You visited us 1 times! Enjoying our articles? Unlock Full Access!
Question

A cylinder fitted with a movable piston contains liquid water in equilibrium with water vapour at 25. Which operation result in a decrease in the equilibrium vapour pressure?

A
Moving the piston downward a short distance
No worries! We‘ve got your back. Try BYJU‘S free classes today!
B
Removing a small mass of vapour
No worries! We‘ve got your back. Try BYJU‘S free classes today!
C
Removing a small mass of the liquid water
No worries! We‘ve got your back. Try BYJU‘S free classes today!
D
Dissolving salt in the water
Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses
Open in App
Solution

The correct option is D Dissolving salt in the water
Addition of salt always lowers the vapour pressure. Also, vapour pressure of a liquid is its characteristic pressure and depends only on temperature.Adding a solute lowers vapor pressure because the additional solute particles will fill the gaps between the solvent particles and take up space. This means less of the solvent will be on the surface and less will be able to break free to enter the gas phase, resulting in a lower vapor pressure.

flag
Suggest Corrections
thumbs-up
1
similar_icon
Similar questions
View More
Join BYJU'S Learning Program
similar_icon
Related Videos
thumbnail
lock
Le Chateliers Principle
CHEMISTRY
Watch in App
Join BYJU'S Learning Program
CrossIcon