For free expansion of a gas, which is true

  • A

    $Q = W = 0$ and $\Delta U = 0$

  • B

    $Q = 0, W > 0$ and $\Delta U = -W$

  • C

    $W = 0, Q > 0$ and $\Delta U = Q$

  • D

    $W = 0, Q < 0$ and $\Delta U = 0$

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