NEETPhysics-Thermodynamics
NEET Physics Enthalpy Changes MCQ Question
Type: MCQ-conceptual-Medium-Class 11
For a reaction, A(g) ⟶ A(l); ΔH = -3RT. The correct statement for the reaction is
A
|ΔH| < |ΔU|
B
ΔH = ΔU ≠ 0
C
|ΔH| > |ΔU|
D
ΔH = ΔU = 0
Correct Answer
Option A
Detailed Explanation
For phase changes, ΔH = ΔU + ΔnRT. Since Δn = 0 for condensation, |ΔH| < |ΔU|.
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