A cylinder fitted with a movable piston ...

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

Moving the piston downward a short distance

Removing a small amount of vapour

Removing a small amount of the liquid water

Dissolving salt in the water

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The correct Answer is:

Dissolution of salt lowers the V.P. It is also effected by temperature.

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