NEET Physics Laws of Thermodynamics MCQ Question
If the enthalpy change (∆H) for a reaction is -48.51 kJ mol⁻¹ and the temperature is constant, which of the following statements about the reaction's spontaneity can be inferred based on the second law of thermodynamics?
The reaction is always spontaneous regardless of entropy change.
The reaction is non-spontaneous if entropy decreases.
The reaction is spontaneous if entropy increases enough to make ∆G negative.
The reaction's spontaneity cannot be determined without knowing ∆S.
Correct Answer
Detailed Explanation
The second law of thermodynamics states that a reaction is spontaneous if the Gibbs free energy change (∆G) is negative. This requires that the system's entropy change (∆S) is sufficiently positive to outweigh ∆H.
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