AIIMS 2014 Physics Thermodynamics MCQ Question
Assertion: A process for which ΔS_syst. > 0 as well as ΔH > 0, passes from non-spontaneous to spontaneous state as temperature is increased. Reason: At higher temperature, TΔS exceeds ΔH.
Both Assertion and Reason are true and Reason is the correct explanation of Assertion
Both Assertion and Reason are true and Reason is not the correct explanation of Assertion
Assertion is true but Reason is false
Both Assertion and Reason are false
Correct Answer
Detailed Explanation
The assertion is true because a process with a positive change in entropy (ΔS_syst > 0) and positive enthalpy change (ΔH > 0) can become spontaneous at higher temperatures, as the temperature can provide enough energy to overcome the enthalpic barrier. The reason is also true because, at elevated temperatures, the term TΔS becomes larger than ΔH, making the Gibbs free energy change (ΔG = ΔH - TΔS) negative, thus driving the process to spontaneity. Therefore, both statements are correct, and the reason accurately explains the assertion.
Found an issue with this question?