Question

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

• A. $\Delta U =0, \Delta S _{\text {total }}=0$
• B. $\Delta U \neq 0, \Delta S _{\text {total }} \neq 0$
• C. $\Delta U =0, \Delta S _{\text {total }} \neq 0$
• D. $\Delta U \neq 0, \Delta S _{\text {total }}=0$

Answer 1

Answer: (C)

For an isothermal process, $\Delta T =0$
$ \therefore \Delta U =0$
For an irreversible expansion, $\Delta S _{\text {total }} \neq 0$