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JEE Main202528 Jan 2025Evening ShiftChemistryThermodynamics (C)Actual

An ideal gas undergoes a cyclic transformation starting from the point A and coming back to the same point by tracing the path A B C D A as shown in the three cases above. Choose the correct option regarding U :

Options

  1. AU ( Case-I )= U ( Case-II )= U ( Case-III )
  2. BU ( Case-I ) U ( Case-III ) U ( Case-II )
  3. CU ( Case-III ) U ( Case-II ) U ( Case-I )
  4. DU ( Case-I ) U ( Case-II ) U ( Case-III )

Correct answer

A. U ( Case-I )= U ( Case-II )= U ( Case-III )

Step-by-step solution

As internal energy ' U ' is a state function, its cyclic integral must be zero in a cyclic process U case (I)= U case ( II )= U case ( III )

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