JEE Main Chemistry Previous Year Questions 2025 (2025–2025)

369 JEE Main Chemistry previous-year questions spanning 2025–2025.

Chemistry 2025 · Amines

When a concentrated solution of sulphanilic acid and 1-naphthylamine is treated with nitrous acid (273 K) and acidified with acetic acid, the mass (g) of 0.1 mole of product formed is : Given molar mass in $\mathrm{g~mol^{-1}}$ H:1, C:12, N:14, O:16, S:32

Chemistry 2025 · Hydrocarbons

Given below are two statements: Statement (I): Neopentane forms only one monosubstituted derivative. Statement (II): Melting point of neopentane is higher than n-pentane In the light of the above statements, choose the most appropriate answer from the options given below:

Chemistry 2025 · Chemical Bonding and Molecular Structure

Which among the following molecules is (a) involved in $\mathrm{sp^3d}$ hybridization, (b) has different bond lengths and (c) has lone pair of electrons on the central atom?

Chemistry 2025 · Practical Chemistry

Formation of $\mathrm{Na}_4[\mathrm{Fe}(\mathrm{CN})_5\mathrm{NOS}]$, a purple coloured complex formed by addition of sodium nitroprusside in sodium carbonate extract of salt indicates the presence of:

Chemistry 2025 · Organic Chemistry - Some Basic Principles and Techniques

In 3, 3-dimethylhex-1-ene-4-yne, there are $\mathbf{sp}^3$, $\mathbf{sp}^2$ and $\mathbf{sp}$ hybridised carbon atoms respectively:

Chemistry 2025 · Structure of Atom

Which of the following statements are true? (A) The subsidiary quantum number $l$ describes the shape of the orbital occupied by the electron. {{IMG1}} is the boundary surface diagram of the $2\mathrm{p_x}$ orbital. (C) The $+$ and $-$ signs in the wave function of the $2\mathrm{p_x}$ orbital refer to charge. (D) The wave function of $2\mathrm{p_x}$ orbital is zero everywhere in the xy plane.

Chemistry 2025 · Aldehydes, Ketones and Carboxylic Acids

Consider the following reactions. From these reactions which reaction will give carboxylic acid as a major product? (A) $\mathrm{R - C \equiv N} \xrightarrow[\text{mild condition}]{\mathrm{(i) H^+ / H_2O}}$ (B) $\mathrm{R - MgX} \xrightarrow[\mathrm{(ii) H_3O^+}]{{\mathrm{(i) CO_2}}}$ (C) $\mathrm{R - C \equiv N} \xrightarrow[\mathrm{(ii) H_3O^+}]{{\mathrm{(i) SnCl_2 / HCl}}}$ (D) $\mathrm{R \cdot CH_2 \cdot OH} \xrightarrow{\mathrm{PCC}}$ (E){{MAIN_IMG}} Choose the correct answer from the options given below:

Chemistry 2025 · Classification of Elements and Periodicity in Properties

Electronic configuration of four elements A, B, C and D are given below : (A) $1\mathrm{s}^2 2\mathrm{s}^2 2\mathrm{p}^3$ (B) $1\mathrm{s}^2 2\mathrm{s}^2 2\mathrm{p}^4$ (C) $1\mathrm{s}^2 2\mathrm{s}^2 2\mathrm{p}^5$ (D) $1\mathrm{s}^2 2\mathrm{s}^2 2\mathrm{p}^2$ Which of the following is the correct order of increasing electronegativity (Pauling's scale)?

Chemistry 2025 · Organic Chemistry - Some Basic Principles and Techniques

Match List-I with List-II: $$ \begin{array}{|l|l|} \hline \begin{array}{c} \textbf{List-I} \\ \textbf{(Purification technique)} \end{array} & \begin{array}{c} \textbf{List-II} \\ \textbf{(Mixture of organic compounds)} \end{array} \\ \hline \text{(A)} \quad \text{Distillation (simple)} & \text{(I)} \quad \text{Diesel + Petrol} \\ \hline \text{(B)} \quad \text{Fractional distillation} & \text{(II)} \quad \text{Aniline + Water} \\ \hline \text{(C)} \quad \text{Distillation under reduced pressure} & \text{(III)} \quad \text{Chloroform + Aniline} \\ \hline \text{(D)} \quad \text{Steam distillatio

Chemistry 2025 · Haloalkanes and Haloarenes

Match List-I with List-II: $$ \begin{array}{|l|l|} \hline \begin{array}{c} \textbf{List-I} \\ \textbf{(Reaction)} \end{array} & \begin{array}{c} \textbf{List-II} \\ \textbf{(Name of reaction)} \end{array} \\ \hline \text{(A)} \quad \text{2Ar-X} + \text{2Na} \xrightarrow{\text{Dry Ether}} \text{Ar-Ar} + \text{2NaX} & \text{(I)} \quad \text{Lucas reaction} \\ \hline \text{(B)} \quad \mathrm{ArN_2^+X^-} \xrightarrow{\mathrm{Cu / HCl}} \mathrm{ArCl} + \mathrm{N_2 \uparrow} + \mathrm{CuX} & \text{(II)} \quad \text{Finkelstein reaction} \\ \hline \text{(C)} \quad \mathrm{C_2H_5Br} + \mathrm{NaI} \x

Chemistry 2025 · Equilibrium

Consider the following chemical equilibrium of the gas phase reaction at a constant temperature : $$\mathrm {A} (\mathrm {g}) \rightleftharpoons \mathrm {B} (\mathrm {g}) + \mathrm {C} (\mathrm {g})$$ If $p$ being the total pressure, $K_p$ is the pressure equilibrium constant and $\alpha$ is the degree of dissociation, then which of the following is true at equilibrium?

Chemistry 2025 · Equilibrium

Which of the following graphs correctly represents the variation of thermodynamic properties of Haber's process?

Chemistry 2025 · Organic Chemistry - Some Basic Principles and Techniques

In Dumas' method for estimation of nitrogen, 0.5 gram of an organic compound gave $60~\mathrm{mL}$ of nitrogen collected at $300\mathrm{K}$ temperature and $715~\mathrm{mmHg}$ pressure. The percentage composition of nitrogen in the compound (Aqueous tension at $300\mathrm{K} = 15~\mathrm{mmHg}$) is

Chemistry 2025 · Coordination Compounds

The d-orbital electronic configuration of the complex among $[\mathrm{Co(en)_3}]^{3+}$, $[\mathrm{CoF_6}]^{3-}$, $[\mathrm{Mn(H_2O)_6}]^{2+}$ and $[\mathrm{Zn(H_2O)_6}]^{2+}$ that has the highest CFSE is:

Chemistry 2025 · Coordination Compounds

The type of hybridization and the magnetic property of $[\mathrm{MnCl}_6]^{3-}$ are:

Chemistry 2025 · Solutions

'x' g of NaCl is added to water in a beaker with a lid. The temperature of the system is raised from $1^{\circ}\mathrm{C}$ to $25^{\circ}\mathrm{C}$. Which out of the following plots, is best suited for the change in the molarity (M) of the solution with respect to temperature? [Consider the solubility of NaCl remains unchanged over the temperature range]

Chemistry 2025 · Chemical Thermodynamics

Arrange the following in order of magnitude of work done by the system / on the system at constant temperature : (a) $|\mathrm{w}_{\mathrm{reversible}}|$ for expansion in infinite stage. (b) $|\mathrm{w}_{\mathrm{irreversible}}|$ for expansion in single stage. (c) $|\mathrm{w}_{\mathrm{reversible}}|$ for compression in infinite stage. (d) $|\mathrm{w}_{\mathrm{irreversible}}|$ for compression in single stage. Choose the correct answer from the options given below:

Chemistry 2025 · Chemical Kinetics

Reactant A converts to product D through the given mechanism (with the net evolution of heat): $\mathrm{A} \rightarrow \mathrm{B}$ slow; $\Delta \mathrm{H} = +\mathrm{ve}$ $\mathrm{B} \rightarrow \mathrm{C}$ fast; $\Delta \mathrm{H} = -\mathrm{ve}$ $\mathrm{C} \rightarrow \mathrm{D}$ fast; $\Delta \mathrm{H} = -\mathrm{ve}$ Which of the following represents the above reaction mechanism?

Chemistry 2025 · p-Block Elements

The nature of oxide $(\mathrm{TeO}_2)$ and hydride $(\mathrm{TeH}_2)$ formed by Te, respectively are:

Chemistry 2025 · Biomolecules

A tetrapeptide "x" on complete hydrolysis produced glycine (Gly), alanine (Ala), valine (Val), leucine (Leu) in equimolar proportion each. The number of tetrapeptides (sequences) possible involving each of these amino acids is
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