Sign In

JEE MAIN - Chemistry (2025 - 22nd January Evening Shift)

1
When sec-butylcyclohexane reacts with bromine in the presence of sunlight, the major product is :
Answer
(D)
JEE Main 2025 (Online) 22nd January Evening Shift Chemistry - Hydrocarbons Question 4 English Option 4
2

Given below are two statements :

Statement (I) : Corrosion is an electrochemical phenomenon in which pure metal acts as an anode and impure metal as a cathode.

Statement (II) : The rate of corrosion is more in alkaline medium than in acidic medium.

In the light of the above statements, choose the correct answer from the options given below :

Answer
(C)
Statement I is true but Statement II is false
3
The most stable carbocation from the following is :
Answer
(C)
JEE Main 2025 (Online) 22nd January Evening Shift Chemistry - Basics of Organic Chemistry Question 8 English Option 3
4
The correct order of the following complexes in terms of their crystal field stabilization energies is :
Answer
(A)
$\left[\mathrm{Co}\left(\mathrm{NH}_3\right)_4\right]^{2+}<\left[\mathrm{Co}\left(\mathrm{NH}_3\right)_6\right]^{2+}<\left[\mathrm{Co}\left(\mathrm{NH}_3\right)_6\right]^{3+}<\left[\mathrm{Co}(\mathrm{en})_3\right]^{3+}$
5
The maximum covalency of a non-metallic group 15 element ' E ' with weakest $\mathrm{E}-\mathrm{E}$ bond is :
Answer
(C)
4
6

Identify the number of structure/s from the following which can be corelated to D-glyceraldehyde.

JEE Main 2025 (Online) 22nd January Evening Shift Chemistry - Biomolecules Question 6 English

Answer
(A)
three
7

Given below are two statements :

Statement (I) : Nitrogen, sulphur, halogen and phosphorus present in an organic compound are detected by Lassaigne's Test.

Statement (II) : The elements present in the compound are converted from covalent form into ionic form by fusing the compound with Magnesium in Lassaigne's test.

In the light of the above statements, choose the correct answer from the options given below :

Answer
(B)
Statement I is true but Statement II is false
8

Consider the given figure and choose the correct option :

JEE Main 2025 (Online) 22nd January Evening Shift Chemistry - Chemical Kinetics and Nuclear Chemistry Question 7 English

Answer
(D)
Activation energy of forward reaction is $E_1+E_2$ and product is less stable than reactant.
9
Arrange the following compounds in increasing order of their dipole moment :

$\mathrm{HBr}, \mathrm{H}_2 \mathrm{~S}, \mathrm{NF}_3$ and $\mathrm{CHCl}_3$
Answer
(C)
$\mathrm{NF}_3<\mathrm{HBr}<\mathrm{H}_2 \mathrm{~S}<\mathrm{CHCl}_3$
10
Density of 3 M NaCl solution is $1.25 \mathrm{~g} / \mathrm{mL}$. The molality of the solution is :
Answer
(A)
2.79 m
11
The molar solubility(s) of zirconium phosphate with molecular formula $\left(\mathrm{Zr}^{4+}\right)_3\left(\mathrm{PO}_4^{3-}\right)_4$ is given by relation :
Answer
(C)
$\left(\frac{K_{s p}}{6912}\right)^{\frac{1}{7}}$
12

Match List - I with List - II.

List - I
(Partial Derivatives)		 List - II
(Thermodynamic Quantity)
(A) $\left(\frac{\partial \mathrm{G}}{\partial \mathrm{T}}\right)_{\mathrm{P}}$ (I) Cp
(B) $\left(\frac{\partial \mathrm{H}}{\partial \mathrm{T}}\right)_{\mathrm{P}}$ (II) $-$S
(C) $\left(\frac{\partial \mathrm{G}}{\partial \mathrm{P}}\right)_{\mathrm{T}}$ (III) Cv
(D) $\left(\frac{\partial \mathrm{U}}{\partial \mathrm{T}}\right)_{\mathrm{V}}$ (IV) V

Choose the correct answer from the options given below :

Answer
(C)
(A)-(II), (B)-(I), (C)-(IV), (D)-(III)
13

Identify the homoleptic complex(es) that is/are low spin.

(A) $\left[\mathrm{Fe}(\mathrm{CN})_5 \mathrm{NO}\right]^{2-}$

(B) $\left[\mathrm{CoF}_6\right]^{3-}$

(C) $\left[\mathrm{Fe}(\mathrm{CN})_6\right]^{4-}$

(D) $\left[\mathrm{Co}\left(\mathrm{NH}_3\right)_6\right]^{3+}$

(E) $\left[\mathrm{Cr}\left(\mathrm{H}_2 \mathrm{O}\right)_6\right]^{2+}$

Choose the correct answer from the options given below :

Answer
(A)
(C) and (D) only
14

JEE Main 2025 (Online) 22nd January Evening Shift Chemistry - Haloalkanes and Haloarenes Question 9 English

The maximum number of RBr producing 2-methylbutane by above sequence of reactions is __________ . (Consider the structural isomers only)

Answer
(C)
4
15
The alkane from below having two secondary hydrogens is :
Answer
(D)
2,2,3,3-Tetramethylpentane
16

JEE Main 2025 (Online) 22nd January Evening Shift Chemistry - Aldehydes, Ketones and Carboxylic Acids Question 10 English

Residue (A) + HCl (dil) $\rightarrow$ Compound (B)

Structure of residue (A) and compound (B) formed respectively is :

Answer
(C)
JEE Main 2025 (Online) 22nd January Evening Shift Chemistry - Aldehydes, Ketones and Carboxylic Acids Question 10 English Option 3
17

Given below are two statements :

Statement (I) : An element in the extreme left of the periodic table forms acidic oxides.

Statement (II) : Acid is formed during the reaction between water and oxide of a reactive element present in the extreme right of the periodic table.

In the light of the above statements, choose the correct answer from the options given below :

Answer
(D)
Statement I is false but Statement II is true
18
The species which does not undergo disproportionation reaction is :
Answer
(A)
$\mathrm{ClO}_4^{-}$
19

Given below are two statements :

Statement (I) : A spectral line will be observed for a $2 p_x \rightarrow 2 p_y$ transition.

Statement (II) : $2 \mathrm{p}_x$ and $2 \mathrm{p}_y$ are degenerate orbitals.

In the light of the above statements, choose the correct answer from the options given below :

Answer
(A)
Statement I is false but Statement II is true
20

Match the Compounds (List - I) with the appropriate Catalyst/ Reagents (List - II) for their reduction into corresponding amines.

List - I
(Compounds)		 List - II
(Catalyst/Reagents)
(A) JEE Main 2025 (Online) 22nd January Evening Shift Chemistry - Compounds Containing Nitrogen Question 6 English 1 (I) $$
\mathrm{NaOH} \text { (aqueous) }
$$
(B) JEE Main 2025 (Online) 22nd January Evening Shift Chemistry - Compounds Containing Nitrogen Question 6 English 2 (II) $$
\mathrm{H}_2 / \mathrm{Ni}
$$
(C) $$
\mathrm{R}-\mathrm{C} \equiv \mathrm{~N}
$$		 (III) $$
\mathrm{LiAlH}_4, \mathrm{H}_2 \mathrm{O}
$$
(D) JEE Main 2025 (Online) 22nd January Evening Shift Chemistry - Compounds Containing Nitrogen Question 6 English 3 (IV) $$
\mathrm{Sn}, \mathrm{HCl}
$$

Choose the correct answer from the options given below :

Answer
(B)
(A)-(III), (B)-(IV), (C)-(II), (D)-(I)
21

Consider the following cases of standard enthalpy of reaction $\left(\Delta \mathrm{H}_{\mathrm{r}}^{\circ}\right.$ in $\left.\mathrm{kJ} \mathrm{mol}^{-1}\right)$

$$\begin{aligned} & \mathrm{C}_2 \mathrm{H}_6(\mathrm{~g})+\frac{7}{2} \mathrm{O}_2(\mathrm{~g}) \rightarrow 2 \mathrm{CO}_2(\mathrm{~g})+3 \mathrm{H}_2 \mathrm{O}(\mathrm{l}) \Delta \mathrm{H}_1^{\circ}=-1550 \\ & \mathrm{C}(\text { graphite })+\mathrm{O}_2(\mathrm{~g}) \rightarrow \mathrm{CO}_2(\mathrm{~g}) \Delta \mathrm{H}_2^{\circ}=-393.5 \\ & \mathrm{H}_2(\mathrm{~g})+\frac{1}{2} \mathrm{O}_2(\mathrm{~g}) \rightarrow \mathrm{H}_2 \mathrm{O}(\mathrm{l}) \Delta \mathrm{H}_3^{\circ}=-286 \end{aligned}$$

The magnitude of $\Delta \mathrm{H}_{f \mathrm{C}_2 \mathrm{H}_6(\mathrm{~g})}^{\circ}$ is ____________ $\mathrm{kJ} \mathrm{mol}^{-1}$ (Nearest integer).

Answer
95
22
The complex of $\mathrm{Ni}^{2+}$ ion and dimethyl glyoxime contains __________ number of Hydrogen (H) atoms.
Answer
14
23
Niobium $(\mathrm{Nb})$ and ruthenium $(\mathrm{Ru})$ have " $x$ " and " $y$ " number of electrons in their respective 4 d orbitals. The value of $x+y$ is __________.
Answer
11
24
20 mL of 2 M NaOH solution is added to 400 mL of 0.5 M NaOH solution. The final concentration of the solution is _________ $\times 10^{-2} \mathrm{M}$. (Nearest integer)
Answer
57
25
The compound with molecular formula $\mathrm{C}_6 \mathrm{H}_6$, which gives only one monobromo derivative and takes up four moles of hydrogen per mole for complete hydrogenation has _________ $\pi$ electrons.
Answer
8OR6