Q25 / 75 · JEE Main 2025 (2 Apr Shift 1) · Chemistry
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?
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?
- A\(d w \neq 0\)
- B\(\mathrm{dq} \neq 0\)
- C\(\mathrm{dU} \neq 0\)
- Correct answerDThe pressure in the vessel \(B\) before opening the stopcock is zero.
Solution
It is free expansion of gas \(\Rightarrow P_{\text {ext }}=0\)
Where \(\mathrm{w}=0, \mathrm{q}=0\) and \(\Delta \mathrm{U}=0\)
Where \(\mathrm{w}=0, \mathrm{q}=0\) and \(\Delta \mathrm{U}=0\)
Hence, the correct answer is option: 'D'.