For free expansion of the gas which of the following is true

Options

A. Q=W=0 and `Delta E_("int") = 0`
B. Q=0,`W gt 0` and `Delta E_("int") = -W`
C. W=0,`Q gt 0`, and `Delta E_("int")=Q`
D. `W gt 0.Q lt 0` and `Delta E_("int") = 0`

Answer

A

Explanation

For free expansion Q=W=0 and `Delta U = 0`.