JEE Mains · Chemistry · STD 11 - 5. Thermodynamics and thermochemistry
A liquid when kept inside a thermally insulated closed vessel at \(25^{\circ} \mathrm{C}\) was mechanically stirred from outside. What will be the correct option for the following thermodynamic parameters ?
- A \(\Delta \mathrm{U} \lt 0, \mathrm{q}=0, \mathrm{w}\gt0\)
- B \(\Delta \mathrm{U}=0, \mathrm{q}=0, \mathrm{w}=0\)
- C \(\Delta \mathrm{U}\gt0, \mathrm{q}=0, \mathrm{w}\gt0\)
- D \(\Delta \mathrm{U}=0, \mathrm{q} \lt 0, \mathrm{w}\gt0\)
Answer & Solution
Correct Answer
(C) \(\Delta \mathrm{U}\gt0, \mathrm{q}=0, \mathrm{w}\gt0\)
Step-by-step Solution
Detailed explanation
Thermally insulated \(\Rightarrow q=0\) from \(\mathrm{I}^{\text {st }}\) law \(\begin{aligned} & \Delta \mathrm{U}=\mathrm{q}+\mathrm{w} \\ & \Delta \mathrm{U}=\mathrm{w} \\ & \mathrm{w}>0, \Delta \mathrm{U}>0 \end{aligned}\)
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