1
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 $)$
2
JEE Main 2025 (Online) 28th January Evening Shift
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Which of the following is/are not correct with respect to energy of atomic orbitals of hydrogen atom?

(A) 1s < 2p < 3d < 4s

(B) 1s < 2s = 2p < 3s = 3p

(C) 1s < 2s < 2p < 3s < 3p

(D) 1s < 2s < 4s < 3d

Choose the correct answer from the options given below :

A

(A) and (B) only

B

(A) and (C) only

C

(B) and (D) only

D

(C) and (D) only

3
JEE Main 2025 (Online) 28th January Evening Shift
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The amphoteric oxide among $\mathrm{V}_2 \mathrm{O}_3, \mathrm{~V}_2 \mathrm{O}_4$ and $\mathrm{V}_2 \mathrm{O}_5$, upon reaction with alkali leads to formation of an oxide anion. The oxidation state of V in the oxide anion is :
A

+ 4

B

+ 5

C

+ 3

D

+ 7

4
JEE Main 2025 (Online) 28th January Evening Shift
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Identify product [A], [B] and [C] in the following reaction sequence.

$\mathrm{CH}_3-\mathrm{C} \equiv \mathrm{CH} \xrightarrow[\mathrm{H}_2]{\mathrm{Pd} / \mathrm{C}}[\mathrm{A}] \xrightarrow[\text { (ii) } \mathrm{Zn}, \mathrm{H}_2 \mathrm{O}]{\text { (i) } \mathrm{O}_3}[\mathrm{~B}]+[\mathrm{C}]$

A

[A]: CH3—CH=CH2, [B]: CH3CHO, [C]: CH3CH2OH

B

[A]: CH3—CH=CH2, [B]: CH3CHO, [C]: HCHO

C

[A]: CH3CH2CH3, [B]: CH3CHO, [C]: HCHO

D
JEE Main 2025 (Online) 28th January Evening Shift Chemistry - Hydrocarbons Question 13 English Option 4
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