AIPMT PRELIMS2007Physics-Thermodynamics
AIPMT PRELIMS 2007 Physics Enthalpy MCQ Question
Type: MCQ-conceptual-Medium-Class 11
Consider the following reactions: (i) H⁺(aq) + OH⁻(aq) → H₂O(l); [ΔH = -X₁ kJ mol⁻¹] (ii) H₂(g) + 1/2 Ω₂(g) → H₂O(l); [ΔH = -X₂ kJ mol⁻¹] (iii) CO₂(g) + H₂(g) → CO(g) + H₂O; [ΔH = -X₃ kJ mol⁻¹] (iv) C₂H₂(g) + 5/2 Ω₂(g) → 2CO₂(g) + H₂O(l); [ΔH = -X₄ kJ mol⁻¹] Enthalpy of formation of H₂O(l) is
A
+X₄ kJ mol⁻¹
B
-X₁ kJ mol⁻¹
C
+X₁ kJ mol⁻¹
D
-X₂ kJ mol⁻¹
Correct Answer
Option D
Detailed Explanation
The enthalpy of formation of H₂O(l) is given by the reaction H₂(g) + 1/2 Ω₂(g) → H₂O(l), which corresponds to ΔH = -X₂ kJ mol⁻¹.
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