JEE Main 20252 AprilMorning Shift
- Exam
- JEE Main
- Year
- 2025
- Date
- 2 April
- Shift
- Morning Shift
- Subject
- Chemistry
- Chapter
- Thermodynamics (C)
JEE Main 2025 · 2 April · Morning Shift · Chemistry · Thermodynamics (C)
Two vessels A and B are connected via stopcock. The vessel A is...
Two vessels A and B are connected via stopcock. The vessel A is filled with a gas at a certain pressure. The entire assembly is immersed in water and is allowed to come to thermal equilibrium with water. After opening the stopcock the gas from vessel A expands into vessel B and no change in temperature is observed in the thermometer. Which of the following statement is true?
Options
- A(d w \neq 0)
- B(\mathrm{dq} \neq 0)
- C(\mathrm{dU} \neq 0)
- DThe pressure in the vessel before opening the stopcock is zero.
Correct answer
D. The pressure in the vessel before opening the stopcock is zero.
Step-by-step solution
It is free expansion of gas (\Rightarrow P_{\text{ext }}=0)Where (\mathrm{w}=0, \mathrm{q}=0) and (\Delta \mathrm{U}=0)