MEDIUMMCQ SINGLEJEE Mains ChemistryPhysical ChemistryThermodynamics and ThermochemistryPrevious Year Questions

For irreversible expansion of an ideal gas under isothermal condition, the correct option is (NEET 2021)

A.ΔU = 0, ΔStotal ≠ 0✓ Correct

B.ΔU ≠ 0, ΔStotal = 0

C.ΔU = 0, ΔStotal = 0

D.ΔU ≠ 0, ΔStotal ≠ 0

Explanation

For irreversible processes, the entropy of the universe increases, i,e., ΔStotal > 0 Also, since the process is isothermal (ΔT = 0) and gas is ideal, ΔU = nCvΔt = 0. THERMODYNAMICS AND THERMOCHEMISTRY 58

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