In case of 'free expansion', which one of the following statements is 'WRONG'? (a) It is an instantaneous change. (b) The system is not in thermodynamic equilibrium. (c) Free expansion can be plotted in a p-v diagram. (d) It is an uncontrolled change.

Answer: (c). Free expansion is sudden and uncontrolled; intermediate states are not equilibrium states. Only equilibrium states have definite P and V, so the process cannot be plotted on a p - V diagram. So the wrong statement is (c).

In case of 'free expansion', which one of the following statements is… | MHT CET 2026 (20 May, Shift 1)

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P-V Diagrams & Cyclic Processes

In case of 'free expansion', which one of the following statements is 'WRONG'?

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Answer: (c)

Free expansion is sudden and uncontrolled; intermediate states are not equilibrium states.
Only equilibrium states have definite $P$ and $V$ , so the process cannot be plotted on a $p$ - $V$ diagram.
So the wrong statement is (c).

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