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Q.

Two soap bubbles combine under isothermal conditions to form a single soap bubble. If in this process, the change in volume is ‘V’ and change in area is ‘S’, then  

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a

3PV+4TS=0 

b

PV+TS=0

c

3PV+TS=0

d

4PV+3TS= 0

answer is C.

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Detailed Solution

 (P+4TC)43πC3=(P+4Ta)43πa3+(P+4Tb)43πb3
 43πp(c3a3b3)=43T(4πa2+4πb24πc2)
 PV=43T(S)
 3PV=4TS
 3PV+4TS=0

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