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A cylinder filled with a movable piston contains liquid water in equilibrium with water vapour at 25oC. Which one of the following operations results in a decreace in the equilibrium vapour pressure ?
  • 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
Correct answer is option 'D'. Can you explain this answer?
Most Upvoted Answer
A cylinder filled with a movable piston contains liquid water in equil...
Obviously, because vapour of solution is less than the vapour pressure of pure solvent.
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Community Answer
A cylinder filled with a movable piston contains liquid water in equil...
Explanation:

Equilibrium vapour pressure is the pressure exerted by the vapour on the liquid when the rate of evaporation is equal to the rate of condensation.

When salt is dissolved in water, the vapour pressure of the solution decreases. This is because the salt ions attract water molecules and reduce the number of water molecules available to escape into the vapour phase. Thus, the rate of evaporation decreases, and the equilibrium vapour pressure decreases.

Moving the piston downward a short distance or removing a small amount of vapour or liquid water will not affect the equilibrium vapour pressure as the system will adjust itself to maintain the equilibrium.

Therefore, option D is the correct answer.
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A cylinder filled with a movable piston contains liquid water in equilibrium with water vapour at 25oC. Which one of the following operations results in a decreace in the equilibrium vapour pressure ?a)Moving the piston downward a short distanceb)Removing a small amount of vapourc)Removing a small amount of the liquid waterd)Dissolving salt in the waterCorrect answer is option 'D'. Can you explain this answer? for JEE 2025 is part of JEE preparation. The Question and answers have been prepared according to the JEE exam syllabus. Information about A cylinder filled with a movable piston contains liquid water in equilibrium with water vapour at 25oC. Which one of the following operations results in a decreace in the equilibrium vapour pressure ?a)Moving the piston downward a short distanceb)Removing a small amount of vapourc)Removing a small amount of the liquid waterd)Dissolving salt in the waterCorrect answer is option 'D'. Can you explain this answer? covers all topics & solutions for JEE 2025 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for A cylinder filled with a movable piston contains liquid water in equilibrium with water vapour at 25oC. Which one of the following operations results in a decreace in the equilibrium vapour pressure ?a)Moving the piston downward a short distanceb)Removing a small amount of vapourc)Removing a small amount of the liquid waterd)Dissolving salt in the waterCorrect answer is option 'D'. Can you explain this answer?.
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