RE-NEET2026Chemistry-Thermodynamics
RE-NEET 2026 Chemistry Entropy MCQ Question
Type: MCQ-numerical-Medium-Class 11
Two moles of an ideal gas undergo free expansion from 10 L to 100 L at 300 K. The values of ΔS_system and ΔS_surroundings are (R is universal gas constant)
A
ΔS_system = 4.606 R; ΔS_surroundings = -4.606 R
B
ΔS_system = 0; ΔS_surroundings = 4.606 R
C
ΔS_system = 4.606 R; ΔS_surroundings = 0
D
ΔS_system = 0; ΔS_surroundings = 0
Correct Answer
Option C
Detailed Explanation
In free expansion, the system's entropy increases due to increased volume, but there is no heat exchange with surroundings, so ΔS_surroundings = 0.
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