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Question: Answered & Verified by Expert
A thermodynamic cycle in the pressure \( (\mathrm{P}) \)-volume \( (\mathrm{V}) \) plane is given below: \( \mathrm{AB} \) and \( \mathrm{CD} \) are isothermal processes while \( \mathrm{BC} \) and \( \mathrm{DA} \) are adiabatic processes. The same cycle in the temperature (T)- entropy \( (S) \) plane is :
ChemistryThermodynamics (C)JEE Main
Options:
  • A
  • B
  • C
  • D
Solution:
1009 Upvotes Verified Answer
The correct answer is:

AB is isothermal reversible expansion process i.e. ΔT=0 and S increases as there is increase in volume.

BC is adiabatic reversible expansion process qrev=0 i.e. temperature decreases and ΔS=0

CD is isothermal reversible compression process i.e. ΔT=0 and S decreases as there is decrease in volume.

DA is adiabatic reversible compression process qres=0 i.e. temperature decreases and ΔS=0

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