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Question

Two thermally insulted vessels 1 and 2 are filled with air at temperature (T1,T2), volumes (V1,V2) and pressures (p1,p2) respectively. If the valve joining the two vessels is opened, the temperature inside the vessel at equilibrium will be (P= common pressure).

A
T1+T2
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B
(T1+T2)/2
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C
T1T2p(V1+V2)p1V1T2+p2V2T1
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D
T1T2(p1V1+p2V2)p1V1T2+p2V2T1
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Solution

The correct option is D T1T2p(V1+V2)p1V1T2+p2V2T1
From gas equation we get PV=nRT
Since the number of molecules of gas will remain constant
P1V1RT1+P2V2RT2=P(V1+V2)RTP(V1+V2)RT=P1V1T2+P2V2T1RT2T1T=P(V1+V2)T2T1P1V1T2+P2V2T1

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