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

Question

$\Delta$U $\ne$ 0, $\Delta$S_total = 0

$\Delta$U = 0, $\Delta$S_total = 0

$\Delta$U $\ne$ 0, $\Delta$S_total $\ne$ 0

$\Delta$U = 0, $\Delta$S_total $\ne$ 0

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