NEET Physics Laws of Thermodynamics MCQ Question
Consider a chemical reaction where the enthalpy change (∆H) is +100 kJ/mol and the entropy change (∆S) is +0.3 kJ/mol·K. At what minimum temperature will this reaction become spontaneous?
334 K
300 K
600 K
400 K
Correct Answer
Detailed Explanation
A reaction becomes spontaneous when the Gibbs free energy change (∆G) is negative. Using the equation ∆G = ∆H - T∆S, for spontaneity ∆G < 0, which implies T > ∆H/∆S. Substituting the given values: T > 100/0.3 = 333.33 K, so the minimum temperature is approximately 334 K.
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