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NEET2021ChemistryThermodynamics (C)Actual

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

Options

  1. AΔU = 0 , ΔS total  = 0
  2. BΔU ≠ 0 , ΔS total  ≠ 0
  3. CΔU = 0 , ΔS total  ≠ 0
  4. DΔU ≠ 0 , ΔS total  = 0

Correct answer

C. ΔU = 0 , ΔS total  ≠ 0

Step-by-step solution

Since the process is isothermal, that means temperature will remain constant and internal energy depends only on temperature, so internal energy will also be constant that is ΔU = 0 And since there is irreversible expansion, the entropy of the universe will change. ΔS total  ≠ 0

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