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A cylindrical vessel containing an ideal gas is in vertical position and a piston of mass M which is on the open end of vessel is able to move up or down without friction. If the temperature is increased, then which of the following is correct? 

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Both p and V of the gas will change.
Only p will increase according to Charle's law.
V will change but not p.
p will change but not V.

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detailed solution

Correct option is C

This is a constant pressure (p = M g/A) arrangement.

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