Question:medium
In case of 'free expansion', which one of the following statements is 'WRONG'?
In case of 'free expansion', which one of the following statements is 'WRONG'?
Show Hint
A p-V diagram can show only equilibrium states.
Updated On: Nov 12, 2026
- It is an instantaneous change.
- The system is not in thermodynamic equilibrium.
- Free expansion can be plotted in a p-v diagram.
- It is an uncontrolled change.
Show Solution
The Correct Option is C
Solution and Explanation
Step 1: Check statements
It is instantaneous, uncontrolled, and the system is not in equilibrium. These are all true.
Step 2: Plot condition
A p-V diagram represents a quasi-static path of equilibrium states.
Step 3: Eliminate
Hence the claim about plotting is the false one.
Final Answer:
The false statement is that free expansion can be shown on a p-V diagram. \[ \boxed{\text{(C) }\text{Free expansion can be plotted in a p-v diagram.}} \]
It is instantaneous, uncontrolled, and the system is not in equilibrium. These are all true.
Step 2: Plot condition
A p-V diagram represents a quasi-static path of equilibrium states.
Step 3: Eliminate
Hence the claim about plotting is the false one.
Final Answer:
The false statement is that free expansion can be shown on a p-V diagram. \[ \boxed{\text{(C) }\text{Free expansion can be plotted in a p-v diagram.}} \]
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