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 on a P-V diagram. (d) It is an uncontrolled change.

Answer: (c). Free expansion is instantaneous and uncontrolled; the system is not in equilibrium during it. Non-equilibrium states have no definite P, V, so it 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 2025 (26 Apr, Shift 1)

Q19MHT CET 2025 · 26 APR · SHIFT 1Easy

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 instantaneous and uncontrolled; the system is not in equilibrium during it.
Non-equilibrium states have no definite $P$ , $V$ , so it cannot be plotted on a $P$ - $V$ diagram.
So the wrong statement is (c).

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