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A container with rigid walls is covered with perfectly insulating material. The container is divided into two parts by a partition. One part contains a gas while the other is fully evacuated (vacuum). The partition is suddenly removed. The gas rushes to fill the entire volume and comes to equilibrium after a little time. If the gas is not ideal,

A

the initial internal energy of the gas equals its final internal energy

B

the initial temperature of the gas equals its final temperature

C

the initial pressure of the gas equals its final pressure

D

the initial entropy of the gas equals its final entropy

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The correct Answer is:
A
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