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For irreversible expansion of an ideal gas under isothermal condition, the correct option is:
A
$\Delta U\neq0,\ \Delta S_{total}\neq0$
B
$\Delta U=0,\ \Delta S_{total}\neq0$
C
$\Delta U\neq0,\ \Delta S_{total}=0$
D
$\Delta U=0,\ \Delta S_{total}=0$
Detailed Solution
For an ideal gas, internal energy depends only on temperature; in an isothermal process $\Delta U = 0$.
An irreversible process is spontaneous, so $\Delta S_{total} > 0$, i.e. $\Delta S_{total} \neq 0$.