Which statement about free expansion is wrong

1. A.
   It is an instantaneous change.
2. B.
   The system is not in thermodynamic equilibrium.
3. C.
   Free expansion can be plotted on a P-V diagram.
4. D.
   It is an uncontrolled change.

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1. A.
   Free expansions are adiabatic expansions and there is no exchange of heat between system and environment.
2. B.
   A free expansion can be plotted on a p-V diagram.
3. C.
   There is no work done on the system or by the system.
4. D.
   It is an instantaneous change and the system is not in thermodynamic equilibrium.

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