Home Chemistry Thermodynamics and Thermochemistry Heat of Reaction Heat of combustion of a substance
Chemistry Thermodynamics and Thermochemistry Heat of Reaction Single Correct MCQ
Published on: August 12, 2026

Heat of combustion of a substance

A
Is always positive
B
Is always negative
C
Is equal to heat of formation
D
Nothing can be said without reaction

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The correct answer is:
B
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