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During isothermal expansion of an ideal gas, its

1. internal energy increases
2. enthalpy decreases
3. enthalpy remains unaffected
4. enthalpy reduces to zero

Correct answer: enthalpy remains unaffected

Solution

In an isothermal process, the temperature remains constant, and for an ideal gas, enthalpy depends only on temperature. Hence, the enthalpy remains unaffected.

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