JEE Main 2025 Question Paper (28-Jan-2025) (Shift 2)

Question 1

Consider the elementary reaction $ A(g) + B(g) \to C(g) + D(g) $If the volume of the reaction mixture is suddenly reduced to $\frac{1}{3}$ of its initial volume, the reaction rate will become '$ x $' times the original reaction rate. The value of $ x $ is :

Accepted Answer

$9$

Answer

$\frac{1}{9}$

Answer

$\frac{1}{3}$

Answer

$3$

Question 2

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 the formation of an oxide anion. The oxidation state of $ V $ in the oxide anion is:

Accepted Answer

$+5$

Answer

$+3$

Answer

$+7$

Answer

$+4$

Question 3

Match List-I with List-IIList-I(Saccharides)List-II(Glycosidic-linkages found)(A) Sucrose$\left(\mathrm{III}\right) \quad \alpha \quad 1-\beta \quad 2$(B) Maltose$\left(\mathrm{I}\right) \quad \alpha \quad 1-4$(C) Lactose$\left(\mathrm{IV}\right) \quad \beta \quad 1-4$(D) Amylopectin$\left(\mathrm{II}\right) \quad \alpha \quad 1-4 \quad \text{and} \quad \alpha \quad 1-6$Choose the correct answer from the options given below:

Accepted Answer

$ (A) - (III),  (B) - (I),  (C) - (IV),  (D) - (II) $

Answer

$ (A) - (IV),  (B) - (II),  (C) - (I),  (D) - (III) $

Answer

$(A)-(II),  (B)-(IV),  (C)-(III),  (D)-(I)$

Answer

$(A)-(I),  (B)-(II),  (C)-(III),  (D)-(IV)$

Question 4

Identify product [A], [B] and [C] in the following reaction sequence

Accepted Answer

$\left[A\right]:  CH_3 - CH = CH_2,  \left[B\right]:  CH_3CHO,  \left[C\right]:  HCHO$

Answer

Answer

$ \left[A\right]: CH_3 - CH = CH_2,  \left[B\right]: CH_3CHO,  \left[C\right]: CH_3CH_2OH $

Answer

$\left[A\right]:  CH_3CH_2CH_3,  \left[B\right]:  CH_3CHO,  \left[C\right]:  HCHO$

Question 5

Arrange the following in increasing order of solubility product:$	ext{Ca(OH)}_2, 	ext{AgBr}, 	ext{PbS}, 	ext{HgS}$

Accepted Answer

$\text{HgS} < \text{PbS} < \text{AgBr} < \text{Ca(OH)}_2$

Answer

$\text{PbS} < \text{HgS} < \text{Ca(OH)}_2 < \text{AgBr}$

Answer

\(\text{Ca(OH)}_2

Answer

\(\text{HgS}

List-I (Saccharides)	List-II (Glycosidic-linkages found)
(A) Sucrose	\(\left(\mathrm{III}\right) \quad \alpha \quad 1-\beta \quad 2\)
(B) Maltose	\(\left(\mathrm{I}\right) \quad \alpha \quad 1-4\)
(C) Lactose	\(\left(\mathrm{IV}\right) \quad \beta \quad 1-4\)
(D) Amylopectin	\(\left(\mathrm{II}\right) \quad \alpha \quad 1-4 \quad \text{and} \quad \alpha \quad 1-6\)