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An ideal gas A and a real gas B have their volumes increased from V to 2V under isothermal conditions. The increase in internal energy

1. will be same in both A and B
2. will be zero in both the gases
3. of B will be more than that of A
4. of A will be more than that of B

Correct answer: will be zero in both the gases

Solution

For an ideal gas, internal energy depends only on temperature, and since the process is isothermal, the internal energy change is zero. For a real gas, deviations from ideal behavior may occur, but under isothermal conditions, the internal energy change is also zero. Hence, the increase in internal energy is zero for both gases.

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