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Question

A gas in a container A is in thermal equilibrium with another gas of the same mass in container B. If we denote the corresponding pressures and volumes by the suffices A and B, then which of the following statement is most likely to be true?

A
PA=PB, VAVB
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B
PAPB, VA=VB
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C
PAVBPBVA
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D
PAVAPBVB
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Solution

The correct option is D PAVBPBVA
For an ideal gas PV=nRT=WMRT
PVM=WRT
For gas A, PAVAMA=WART....(1)
For gas B, PBVBMB=WBRT.....(2)
But WA=WB as the masses of two gases are constant. Also TA=TB as thermal equilibrium is present.
Hence, WART=WBRT
So equation (1) = equation (2).
PAVAMA=PBVBMB
PAVAPBVB=MBMA= constant.
PAVBPBVA

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