1
JEE Main 2025 (Online) 2nd April Morning Shift
MCQ (Single Correct Answer)
+4
-1
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JEE Main 2025 (Online) 2nd April Morning Shift Chemistry - Thermodynamics Question 14 English

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
$\mathrm{dq} \neq 0$
B
The pressure in the vessel B before opening the stopcock is zero
C
$\mathrm{dw} \neq 0$
D
$\mathrm{dU} \neq 0$
2
JEE Main 2025 (Online) 29th January Evening Shift
MCQ (Single Correct Answer)
+4
-1
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If $\quad C$ (diamond $) \rightarrow C$ (graphite) $+X \mathrm{~kJ} \mathrm{~mol}^{-1}$

C (diamond) $+\mathrm{O}_2(\mathrm{~g}) \rightarrow \mathrm{CO}_2(\mathrm{~g})+\mathrm{Y} \mathrm{kJ} \mathrm{mol}{ }^{-1}$

C (graphite) $+\mathrm{O}_2(\mathrm{~g}) \rightarrow \mathrm{CO}_2(\mathrm{~g})+\mathrm{Z} \mathrm{kJ} \mathrm{mol}^{-1}$

at constant temperature. Then

A

−X = Y + Z

B

X = Y − Z

C

X = −Y + Z

D

X = Y + Z

3
JEE Main 2025 (Online) 29th January Morning Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

500 J of energy is transferred as heat to 0.5 mol of Argon gas at 298 K and 1.00 atm. The final temperature and the change in internal energy respectively are: Given: R = 8.3 J K-1 mol-1

A

368 K and 500 J

B

348 K and 300 J

C

378 K and 300 J

D

378 K and 500 J

4
JEE Main 2025 (Online) 28th January Evening Shift
MCQ (Single Correct Answer)
+4
-1
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JEE Main 2025 (Online) 28th January Evening Shift Chemistry - Thermodynamics Question 28 English

An ideal gas undergoes a cyclic transformation starting from the point A and coming back to the same point by tracing the path A→B→C→D→A as shown in the three cases above.

Choose the correct option regarding ΔU :

A
$\Delta \mathrm{U}(\text { Case-III })>\Delta \mathrm{U}(\text { Case-II })>\Delta \mathrm{U}(\text { Case-I })$
B
$\Delta \mathrm{U}($ Case-I $)>\Delta \mathrm{U}($ Case-II $)>\Delta \mathrm{U}($ Case-III $)$
C
$\Delta \mathrm{U}($ Case-I $)=\Delta \mathrm{U}($ Case-II $)=\Delta \mathrm{U}($ Case-III $)$
D
$\Delta \mathrm{U}($ Case-I $)>\Delta \mathrm{U}($ Case-III $)>\Delta \mathrm{U}($ Case-II $)$
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