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Introduction to Le Chatelier's Principle

Which factors...

Question

Which factors do not effect the vapour pressure of a liquid at equilibrium?
I. Intermolecular forces of attraction
II. The volume of liquid present
III. The temperature of the liquid.

A

Only I

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B

Only II

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C

I and II

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D

II and III

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Solution

The correct option is A Only II
II. The volume of liquid present do not effect the vapour pressure of a liquid at equilibrium.
We can change the volume of a liquid (keeping temperature constant) but the the vapour pressure of a liquid at equilibrium will remain same.
However the following factors effect the vapour pressure of a liquid at equilibrium.
I. Intermolecular forces of attraction
III. The temperature of the liquid.
Weaker are the intermolecular forces of attraction or higher is the temperature of the liquid, higher is the vapour pressure of a liquid at equilibrium.

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