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

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Moving the piston downward a short distance

Removing a small amount of vapour

Removing a small amount of liquid water

Dissolving some salt in the water.

answer is C.

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Detailed Solution

Removing a small amount of liquid water

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