JEE Mains · Chemistry · STD 11 - 5. Thermodynamics and thermochemistry
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 \(\mathrm{dU} \neq 0\)
- D The pressure in the vessel \(B\) before opening the stopcock is zero.
Answer & Solution
Correct Answer
(D) The pressure in the vessel \(B\) before opening the stopcock is zero.
Step-by-step Solution
Detailed 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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