GATE ME 2026 Set 1 — Question 23
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Thermodynamics → Laws & Properties → Ideal & Real Gas Behaviour
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Question
For an ideal gas, starting from state point 1, two different processes take place. The corresponding final states in these two processes are 2 and 3, lying on same isotherm. If and represent pressure and enthalpy, respectively, then which one of the following options is correct?
Correct answer
(A) h₂ = h₃
Solution
For an ideal gas, enthalpy () is a function of temperature only, expressed as . Since states 2 and 3 lie on the same isotherm, their temperatures are equal (). Consequently, their enthalpies must also be equal, so .
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