NEET2019Chemistry-Thermodynamics
NEET 2019 Chemistry Entropy MCQ Question
Type: MCQ-conceptual-Medium-Class 11
In which case change in entropy is negative?
A
Expansion of a gas at constant temperature
B
Sublimation of solid to gas
C
2H₂(g) → H₂(g)
D
Evaporation of water
Correct Answer
Option C
Detailed Explanation
Entropy decreases when a system becomes more ordered. In the reaction 2H₂(g) → H₂(g), the number of gas molecules decreases, leading to a decrease in entropy.
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