cylinder fitted with a movable piston co...

cylinder fitted with a movable piston contains liquid water in equilibrium with water vapour at `25^(@)C`. Which operation result in a decrease in the equilibrium vapour pressure?

Moving the piston downwards a short distance

Removing a small amount of vaour

Removing a small amount of the liquid water

Dissolving salt in the water

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The correct Answer is:

Addition of salt always lowers the vapour pressure. Also, vapour pressure of a liquid is its characteristics pressure and depends only on temperature.

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