STANDARDPhysics-Thermodynamics
STANDARD Physics Entropy and Enthalpy MCQ Question
Type: MCQ-conceptual-Medium-Class 11
For the reaction, 2Cl₍g₎ → Cl₂₍g₎, the correct option is
A
rH > 0 and ΔS > 0
B
rH > 0 and ΔS < 0
C
rH < 0 and ΔS > 0
D
rH < 0 and ΔS < 0
Correct Answer
Option D
Detailed Explanation
In the reaction, 2Cl₍g₎ → Cl₂₍g₎, the randomness decreases as 2 moles of Cl₍g₎ are converted to 1 mole of Cl₂₍g₎, thus, ΔS < 0. And this is an exothermic reaction, thus, ΔrH < 0.
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