Question:
In thermodynamic process, for free expansion, out of the following select the 'WRONG' statement.
In thermodynamic process, for free expansion, out of the following select the 'WRONG' statement.
Show Hint
Free expansion is an irreversible, non-equilibrium process, so it cannot be drawn as a curve on a p-V diagram.
Updated On: Nov 13, 2026
Free expansion are adiabatic expansions and there is no exchange of heat between a system and its environment.
There is no work done on the system or by the system.
It is an instantaneous change, and the system is not in thermodynamic equilibrium
A free expansion can be plotted on a p-v diagram.
Show Solution
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The Correct Option is D
Solution and Explanation
Step 1: Understanding the Concept
In free expansion a gas expands into vacuum suddenly. There is no heat exchange and no work done.
Step 2: Check Statements
A is true (adiabatic, no heat exchange), B is true (no work), and C is true (instantaneous, not in equilibrium).
Step 3: Wrong Statement
A p-V diagram shows only equilibrium states joined by quasi-static processes. Free expansion passes through non-equilibrium states and cannot be plotted. So D is wrong.
Final Answer:
The wrong statement is that free expansion can be plotted on a p-V diagram. \[ \boxed{\text{(D) }\text{A free expansion can be plotted on a p-v diagram.}} \]
In free expansion a gas expands into vacuum suddenly. There is no heat exchange and no work done.
Step 2: Check Statements
A is true (adiabatic, no heat exchange), B is true (no work), and C is true (instantaneous, not in equilibrium).
Step 3: Wrong Statement
A p-V diagram shows only equilibrium states joined by quasi-static processes. Free expansion passes through non-equilibrium states and cannot be plotted. So D is wrong.
Final Answer:
The wrong statement is that free expansion can be plotted on a p-V diagram. \[ \boxed{\text{(D) }\text{A free expansion can be plotted on a p-v diagram.}} \]
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