NEET2020Chemistry-Thermodynamics
NEET 2020 Chemistry Enthalpy and Entropy MCQ Question
Type: MCQ-conceptual-Medium-Class 11
For the reaction, 2Cl(g) → Cl₂(g), the correct option is:
A
ΔrH < 0 and ΔrS > 0
B
ΔrH < 0 and ΔrS < 0
C
ΔrH > 0 and ΔrS > 0
D
ΔrH > 0 and ΔrS < 0
Correct Answer
Option B
Detailed Explanation
The reaction is exothermic (ΔrH < 0) as it involves bond formation. The entropy decreases (ΔrS < 0) as two moles of gaseous atoms form one mole of a diatomic molecule.
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