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Which of the following changes decrease ...

Which of the following changes decrease the vapour pressure of water kept in a sealed vessel? Decreasing the quantity of water Adding salt to water Decreasing the volume of the vessel to one-half Decreasing the temperature of water

A

Decreasing the quantity of water

B

Adding salt to water

C

Decreasing the volume of the vessel to one-half

D

Decreasing the temperature of water

Text Solution

Verified by Experts

The correct Answer is:
B, D
When salt is added , less surface area is available for the solvent to vaporise and hence , solvent experience less pressure by vapours . Thus , vapour pressure decreases . Moreover , vapour pressure also decrease with decrease in temperature because kinetic energy of the molecules decreases .
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