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Q.

A 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?

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a

Moving the piston downward a short distance

b

Removing a small amount of vapour

c

Removing a small amount of the liquid water

d

Dissolving salt in the water

answer is D.

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Detailed Solution

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

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