JEE MAIN - Chemistry (2025 - 2nd April Morning Shift - No. 13)
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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 ?
$\mathrm{dq} \neq 0$
The pressure in the vessel B before opening the stopcock is zero
$\mathrm{dw} \neq 0$
$\mathrm{dU} \neq 0$
Explanation
It is free expansion of gas $\Rightarrow P_{\text {ext }}=0$
Where $\mathrm{w}=0, \mathrm{q}=0$ and $\Delta \mathrm{U}=0$
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