Second Law – Entropy of Irreversible Processes

2021 1 question

1. 1 Thermodynamics Medium
   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 $\Delta U=0,\ \Delta S_{total}=0$
   Check Answer