AIIMS 2019 Chemistry Enthalpy Change MCQ Question
One mole of a non-ideal gas undergoes a change of state with a change in internal energy, . The change in enthalpy of the process in is.
40.0
42.3
44.0
Not defined because pressure is not constant
Correct Answer
Detailed Explanation
Option C is correct because it accurately represents the change in enthalpy (ΔH) as the difference between the internal energy (U) and the work done by the system, expressed as ΔH = (U₂ - U₁) + (P₂V₂ - P₁V₁). This formulation aligns with the first law of thermodynamics, where enthalpy is defined as H = U + PV.
Option A is incorrect as it does not account for the pressure-volume work associated with the system. Option B, while it includes the correct terms, does not simplify to the proper expression for ΔH. Option D presents a numerical calculation that lacks context and does not relate to the enthalpy change formula.
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