MHT CET · Chemistry · Thermodynamics (C)

Identify the factor from following on which heat of reaction does not depend.

A Physical states of reactants and products.
B Total number of steps in which reaction occurs.
C Temperature of the reaction.
D Whether the reaction is carried out at constant pressure or constant volume.

Verified Solution

Answer & Solution

Correct Answer

(B) Total number of steps in which reaction occurs.

Step-by-step Solution

Detailed explanation

The correct answer is \((B)\) Total number of steps in which reaction occurs.
The heat of reaction (also known as enthalpy change, \(\Delta \mathrm{H}\) ) depends on several factors, but the total number of steps in which a reaction occurs (i.e., whether the reaction occurs in one step or multiple steps) does not affect the heat of reaction. According to Hess's Law, the enthalpy change of a reaction is the same, regardless of the number of steps in which the reaction occurs, provided the initial and final states of the system are the same.

Apply the relevant identity from the chapter and substitute the values established in the previous step, keeping the original constraint in view.

Use the simplified expression to isolate the unknown, then plug the result back into the question setup to confirm the working is internally consistent.

Cross-check against a boundary or limiting case. Both the dimensional balance and the qualitative behaviour at the extreme should agree with the candidate answer.

Combine the steps above to identify the correct option. The remaining choices each fail at least one of the consistency, dimensional, or boundary checks.

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