During a reversible isothermal expansion of an ideal gas, the entropy change is___________________?
Correct answer: A. +ve
- A. +ve
- B. 0
- C. -ve
- D. ∞
Explanation
For an ideal gas, isothermal expansion increases volume, and the entropy change is ΔS = nR ln(V₂/V₁), which is positive when V₂ exceeds V₁. Isothermal means temperature is constant, not entropy.
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