Physics-(general)
NEET Physics (general) MCQ Question
Type: MCQ-diagram based-Hard-Class 11
Consider a diagram of a chemical reaction where Fe2O3 reacts with H2 to form Fe and H2O. Which value represents the standard enthalpy change of this reaction using the given formation enthalpies for H2O, Fe2O3, Fe, and H2?
A
-33.3 kJ mol⁻¹
B
-857.5 kJ mol⁻¹
C
-824.2 kJ mol⁻¹
D
0 kJ mol⁻¹
Correct Answer
Option A
Detailed Explanation
The standard enthalpy change of the reaction is calculated as the sum of the standard enthalpies of formation of the products minus that of the reactants. Using the provided values: ∆fH⁰(H2O) and ∆fH⁰(Fe2O3), the calculation yields -33.3 kJ mol⁻¹.
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