Question:medium
In thermodynamic process for free expansion, select the 'WRONG' statement out of the following options.
In thermodynamic process for free expansion, select the 'WRONG' statement out of the following options.
Show Hint
A free expansion is not a quasi-static process, so it has no path on a p-V diagram.
Updated On: Oct 1, 2026
- Free expansions are adiabatic expansions and there is no exchange of heat between system and environment.
- A free expansion can be plotted on a p-V diagram.
- 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.
Show Solution
The Correct Option is B
Solution and Explanation
Step 1: Test each statement:
A: $Q = 0$, true. C: $W = 0$, true. D: no equilibrium during the process, true.
Step 2: Find the odd one:
B claims a curve on a p-V diagram. That requires equilibrium at every point, which is not so here. So B is the wrong statement.
Final Answer:
The wrong statement is B, option (B). \[ \boxed{\text{B}} \]
A: $Q = 0$, true. C: $W = 0$, true. D: no equilibrium during the process, true.
Step 2: Find the odd one:
B claims a curve on a p-V diagram. That requires equilibrium at every point, which is not so here. So B is the wrong statement.
Final Answer:
The wrong statement is B, option (B). \[ \boxed{\text{B}} \]
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