MHT CET 2026 Chemistry question

Identify the law for the statement "Overall the enthalpy change for a reaction is equal to sum of enthalpy changes of individual steps in the reaction"

(A)First law of thermodynamics
(B)Hess's lawCorrect
(C)Avogadro's law
(D)Second law of thermodynamics

Answer: (B)

Solution

Hess's law of constant heat summation states that the total enthalpy change of a reaction is the same whether it takes place in one step or in several steps; it equals the sum of the enthalpy changes of the individual steps because enthalpy is a state function. This is exactly the statement

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Question ID VK-101637