Physics-Laws of Thermodynamics
NEET Physics Laws of Thermodynamics MCQ Question
Type: MCQ-numerical-Medium-Class 11
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?
A
The reaction is always spontaneous regardless of entropy change.
B
The reaction is non-spontaneous if entropy decreases.
C
The reaction is spontaneous if entropy increases enough to make ∆G negative.
D
The reaction's spontaneity cannot be determined without knowing ∆S.
Correct Answer
Option C
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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