NEET Physics Laws of Thermodynamics MCQ Question
If the enthalpy change (∆H) for a certain reaction is +100 kJ/mol and the entropy change (∆S) is +0.4 kJ/mol·K, at what minimum temperature (in Kelvin) will the reaction become spontaneous?
250 K
200 K
300 K
400 K
Correct Answer
Detailed Explanation
For a reaction to be spontaneous, Gibbs free energy change (∆G) must be negative. Using the equation ∆G = ∆H - T∆S and setting ∆G to zero to find the threshold temperature: 0 = 100 kJ/mol - T(0.4 kJ/mol·K), solving gives T = 250 K.
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