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ChemistryNEET 2021Entropy and Gibbs energy, spontaneity

Thermodynamics

For the irreversible expansion of an ideal gas under isothermal conditions, the correct option is:

  1. A.ΔU=0, ΔStotal=0\Delta U = 0,\ \Delta S_{total} = 0
  2. B.ΔU≠0, ΔStotal≠0\Delta U \neq 0,\ \Delta S_{total} \neq 0
  3. C.ΔU=0, ΔStotal≠0\Delta U = 0,\ \Delta S_{total} \neq 0✓
  4. D.ΔU≠0, ΔStotal=0\Delta U \neq 0,\ \Delta S_{total} = 0

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