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Q.

A sample of a volatile liquid is introduced to an evacuated container with a movable piston. Which change occurs as the piston is raised? (Assume some liquid remains.) 

(P) The fraction of the molecules in the gas phase increases.

 (Q) The pressure in the container decreases.

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a

P only

b

Both P and Q

c

Q only

d

Neither P nor Q

answer is A.

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Detailed Solution

Pressure changes has minor effect on volume of the liquid. 

The change which will occurs as the piston raised is, the fraction of the molecules in the gas phase increases.

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