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A valve between a 5 litre tank in which ...

A valve between a 5 litre tank in which the gas pressure is 9 atm and a 10 litre tank containing gas at 6 atm is opened and pressure equilibration ensures at a constant temperature. What is the final pressure (in atm) in the two tanks ?

A

15 atm

B

7 atm

C

12 atm

D

21 atm

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