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Chemistry Thermodynamics and Thermochemistry Thermodynamics Single Correct MCQ
Published on: August 13, 2026

A mixture of 2 mole of CO and 1 mole of O 2 , in a closed vessel is ignited to convert the CO to CO 2 . If Δ H is the enthalpy change and Δ U is the change in internal energy then:

A
Δ H < Δ U
B
Δ H > Δ U
C
Δ H = Δ U
D
Δ H = 2 Δ U

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Verified by Experts
The correct answer is:
A

2CO + O 2 ⎯→ 2CO 2 is a exothermic reaction ; heat is evolved from the system i.e. energy is lowered, thus exothermic reaction occur spontaneously on account of decrease in enthalpy of system thus Δ H < Δ U.

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