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

Question

A cylinder fitted with a movable piston contains liquid water in equilibrium with water vapour at $25^\circ	ext{C}$. Which of the following operation(s) results in a decrease in the equilibrium vapour pressure at $25^\circ	ext{C}$?

Prashant Kotian · Accepted Answer

Correct answer: D. The equilibrium vapour pressure of a pure liquid depends only on temperature. Altering the volume or the amounts of pure liquid/vapour (options a, b, c) does not change the vapour pressure at a constant temperature. However, adding a non-volatile solute (like salt) lowers the vapour pressure of the liquid according to Raoult's law. Therefore, correct answer is D.

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