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Chemistry Thermodynamics and Thermochemistry HARD Single Correct MCQ
Published on: August 14, 2026

“The quantity of heat which must be supplied to decompose a compound into its element is equal to the heat evolved during the formation of that compound from the elements.” This statement is known as

A
Hess's law
B
Joule's law
C
Le–chatelier's principle
D
Lavoiser and Laplace law

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Verified by Experts
The correct answer is:
D

It is Lavoisier and Laplace law. This is another law of thermochemistry which was put forward before Hess's law.

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