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Thermodynamics question

2021 · Q121
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Thermodynamics question

2021 · Q121

NEETChemistryThermodynamicsMCQ+4 / −1
For irreversible expansion of an ideal gas under isothermal condition, the correct option is :
  1. A
    Δ\DeltaΔU ≠\ne= 0, Δ\DeltaΔStotal = 0
  2. B
    Δ\DeltaΔU = 0, Δ\DeltaΔStotal = 0
  3. C
    Δ\DeltaΔU ≠\ne= 0, Δ\DeltaΔStotal ≠\ne= 0
  4. D
    Δ\DeltaΔU = 0, Δ\DeltaΔStotal ≠\ne= 0
View written solutionFree

Correct answer: D

∙\bullet∙ For a spontaneous process, Δ\DeltaΔStotal > 0 and since irreversible process is always spontaneous therefore Δ\DeltaΔStotal > 0.

∙\bullet∙ Since Δ\DeltaΔU = nCVΔ\DeltaΔT and Δ\DeltaΔT = 0 for isothermal process therefore Δ\DeltaΔU = 0.

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