AIPMT MAINS2010Chemistry-Thermodynamics
AIPMT MAINS 2010 Chemistry Enthalpy MCQ Question
Type: MCQ-numerical-Medium-Class 11
The following two reactions are known: Fe₂O₃(s) + 3CO(g) → 2Fe(s) + 3CO₂(g); ΔH = −26.8 kJ FeO(s) + CO(g) → Fe(s) + CO₂(g); ΔH = −16.5 kJ The value of ΔH for the following reaction Fe₂O₃(s) + CO(g) → 2FeO(s) + CO₂(g) is
A
+10.3 kJ
B
−43.3 kJ
C
−10.3 kJ
D
+6.2 kJ
Correct Answer
Option D
Detailed Explanation
Using Hess's law, ΔH = −26.8 − (2×−16.5) = 6.2 kJ.
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