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GATE 2025 MT – Question 12

Metallurgical Thermodynamics · Thermodynamic laws and functions · 1 mark · Multiple choice

For an isobaric process, the heat transferred is equal to the change in ____________ of the system.

  1. enthalpy
  2. entropy
  3. Helmholtz free energy
  4. Gibbs free energy

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Show answer and explanation

Correct answer: (A) enthalpy

Explanation

For a closed system with only pressure–volume work, the first law gives δQ=dU+P dV. At constant pressure dH=d(U+PV)=dU+P dV, so Q=ΔH. Therefore **enthalpy, A**, under the usual pressure–volume-work assumption.