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Question: Answered & Verified by Expert
An ideal gas undergoes isothermal expansion at constant pressure. During the process:
ChemistryThermodynamics (C)JEE MainJEE Main 2017 (09 Apr Online)
Options:
  • A Enthalpy remains constant but entropy increases
  • B Enthalpy decreases but entropy increases
  • C Enthalpy increases but entropy decreases
  • D Both enthalpy and entropy remain constant
Solution:
1327 Upvotes Verified Answer
The correct answer is: Enthalpy remains constant but entropy increases
ΔH= nC p ΔT=0,ΔT=0
Pext = defined
so process is irreversible.
ΔS=nRln  V f /V i 0

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