For an isothermal and free expansion of an ideal gas, which of the following is true?
1. For an adiabatic change, heat \((q)\) is non zero.
2. For an adiabatic change, heat \((q)\) is zero.
3. For an isothermal reversible change, heat (q) is zero.
4. For an isothermal process, the temperature changes.

Apply the relevant identity from the chapter and substitute the values established in the previous step, keeping the original constraint in view.

Use the simplified expression to isolate the unknown, then plug the result back into the question setup to confirm the working is internally consistent.

Cross-check against a boundary or limiting case. Both the dimensional balance and the qualitative behaviour at the extreme should agree with the candidate answer.

Combine the steps above to identify the correct option. The remaining choices each fail at least one of the consistency, dimensional, or boundary checks.