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NEET 2021
Exam
NEET
Year
2021
Subject
Chemistry
Chapter
Thermodynamics (C)

NEET 2021 · Chemistry · Thermodynamics (C)

For irreversible expansion of an ideal gas under isothermal...

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

Options

  1. AΔU=0,ΔStotal=0\Delta U = 0, {\Delta S}_{\text{total}} = 0
  2. BΔU≠0,ΔStotal≠0\Delta U \ne 0, {\Delta S}_{\text{total}} \ne 0
  3. CΔU=0,ΔStotal≠0\Delta U = 0, {\Delta S}_{\text{total}} \ne 0
  4. DΔU≠0,ΔStotal=0\Delta U \ne 0, {\Delta S}_{\text{total}} = 0

Correct answer

C. ΔU=0,ΔStotal≠0\Delta U = 0, {\Delta S}_{\text{total}} \ne 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\Delta U = 0

And since there is irreversible expansion, the entropy of the universe will change. ΔStotal≠0{\Delta S}_{\text{total}} \ne 0

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