NEET Physics Heat Engines Assertion Reason Question
Assertion (A): The net energy available to do useful work in a chemical reaction is represented by the Gibbs free energy change (∆G). | Reason (R): For a spontaneous process, the total entropy change (∆S total) is greater than zero.
Both A and R are true, and R is the correct explanation of A.
Both A and R are true, but R is not the correct explanation of A.
A is true but R is false.
A is false.
Correct Answer
Detailed Explanation
The NCERT context states that ∆G is the net energy available to do useful work and for a spontaneous process, T∆S sys – ∆H sys > 0, indicating ∆S total > 0, which explains A.
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