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Two cylinders A and B of equal capacity are connected to each other via a stop cock. A contains an ideal gas at standard temperature and pressure. B is completely evacuated. The entire system is thermally insulated. The stop cock is suddenly opened. The process is:

1. adiabatic
2. isochoric
3. isobaric
4. isothermal

Correct answer: adiabatic

Solution

Since the system is thermally insulated, no heat exchange occurs with the surroundings. Therefore, the process is adiabatic.

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