JEE Main Chemistry Previous Year Questions 2026 (2026–2026)

25 JEE Main Chemistry previous-year questions spanning 2026–2026.

Chemistry 2026 · Hydrocarbons

Identify A in the following reaction. {{IMG1}}

Chemistry 2026 · p-Block Elements

Consider the following reactions. $PbCl_{2} + K_{2}CrO_{4} \rightarrow A + 2KCl$ (Hot solution) $A + NaOH \rightleftharpoons B + Na_{2}CrO_{4}$ $PbSO_{4} + 4CH_{3}COONH_{4} \rightarrow (NH_{4})_{2}SO_{4} + X$ In the above reactions, A, B and X are respectively

Chemistry 2026 · Classification of Elements and Periodicity in Properties

Which of the following represents the correct trend for the mentioned property? A. $F > P > S > B$ – First Ionization Energy B. $Cl > F > S > P$ – Electron Affinity C. $K > Al > Mg > B$ – Metallic character D. $K_{2}O > Na_{2}O > MgO > Al_{2}O_{3}$ – Basic character Choose the correct answer from the option given below.

Chemistry 2026 · Haloalkanes and Haloarenes

A hydrocarbon ‘P’ ($C_{4}H_{8}$) on reaction with HCl gives an optically active compound ‘Q’ ($C_{4}H_{9}Cl$) which on reaction with one mole of ammonia gives compound ‘R’ ($C_{4}H_{11}N$). ‘R’ on diazotization followed by hydrolysis gives ‘S’. Identify P, Q, R and S.

Chemistry 2026 · p-Block Elements

Given below are two statements : Statement I : The number of pairs among $[SiO_{2}, CO_{2}]$, $[SnO, SnO_{2}]$, $[PbO, PbO_{2}]$ and $[GeO, GeO_{2}]$, which contain oxides that are both amphoteric is 2. Statement II : $BF_{3}$ is an electron deficient molecule can act as a lewis acid, forms adduct with $NH_{3}$ and has a trigonal planar geometry. In the light of the above statement, choose the correct answer from the option given below.

Chemistry 2026 · Some Basic Concepts of Chemistry

80 mL of a hydrocarbon on mixing with 264 mL of oxygen in a closed U-tube undergoes complete combustion. The residual gases after cooling to 273 K occupy 224 mL. When the system is treated with KOH solution, the volume decreases to 64 mL. The formula of the hydrocarbon is :

Chemistry 2026 · Some Basic Concepts of Chemistry

14.0 g of calcium metal is allowed to react with excess HCl at 1.0 atm pressure and 273 K. Which of the following statements is incorrect? [Given : Molar mass in $\mathrm{g \ mol^{-1}}$ of Ca–40, Cl–35.5, H–1]

Chemistry 2026 · Organic Chemistry - Some Basic Principles and Techniques

In Carius method, 0.75 g of an organic compound gave 1.2 g of barium sulphate, find percentage of sulphur (molar mass $32\text{ g mol}^{-1}$). Molar mass of barium sulphate is $233\text{ g mol}^{-1}$.

Chemistry 2026 · Solutions

Elements P and Q form two types of non-volatile, non-ionizable compounds PQ and $PQ_{2}$. When 1 g of PQ is dissolved in 50 g of solvent ‘A’. $\Delta T_{b}$ was 1.176 K while when 1 g of $PQ_{2}$ is dissolved in 50 g of solvent ‘A’, $\Delta T_{b}$ was 0.689 K. ($K_{b}$ of ‘A’ = $5\text{ K kg mol}^{-1}$). The molar masses of elements P and Q (in $\text{g mol}^{-1}$) respectively, are :

Chemistry 2026 · Amines

An organic compound (P) on treatment with aqueous ammonia under hot condition forms compound (Q) which on heating with $Br_{2}$ and KOH forms compound (R) having molecular formula $C_{9}H_{7}N$. Names of P, Q and R respectively are.

Chemistry 2026 · Aldehydes, Ketones and Carboxylic Acids

An organic compound “P” of molecular formula $C_{6}H_{12}O_{3}$ gives positive Iodoform test but negative Tollen’s test. When “P” is treated with dilute acid, it produces “Q”. “Q” gives positive Tollen’s test and also iodoform test. The structure of “P” is :

Chemistry 2026 · Organic Chemistry - Some Basic Principles and Techniques

From the following, the least stable structure is :

Chemistry 2026 · d and f Block Elements

$MnO_{4}^{2-}$, in acidic medium, disproportionates to :

Chemistry 2026 · Chemical Bonding and Molecular Structure

Given below are two statements: Statement I: The number of species among $\mathrm{SF}_4$, $\mathrm{NH}_4^+$, $[\mathrm{NiCl}_4]^{2-}$, $\mathrm{XeF}_4$, $[\mathrm{PtCl}_4]^{2-}$, $\mathrm{SeF}_4$ and $[\mathrm{Ni(CN)}_4]^{2-}$, that have tetrahedral geometry is 3. Statement II: In the set $[NO_{2}, BeH_{2}, BF_{3}, AlCl_{3}]$, all the molecules have incomplete octet around central atom. In the light of the above statements, choose the correct answer from the options given below:

Chemistry 2026 · Coordination Compounds

Given below are two statements: Statement I: Among $[\mathrm{Cu}(\mathrm{NH}_{3})_{4}]^{2+}$, $[\mathrm{Ni}(\mathrm{en})_{3}]^{2+}$, $[\mathrm{Ni}(\mathrm{NH}_{3})_{6}]^{2+}$ and $[\mathrm{Mn}(\mathrm{H}_{2}\mathrm{O})_{6}]^{2+}$, $[\mathrm{Mn}(\mathrm{H}_{2}\mathrm{O})_{6}]^{2+}$ has the maximum number of unpaired electrons. Statement II: The number of pairs among $\{[NiCl_{4}]^{2-}, [Ni(CO)_{4}]\}$, $\{[NiCl_{4}]^{2-}, [Ni(CN)_{4}]^{2-}\}$ and $\{[Ni(CO)_{4}], [Ni(CN)_{4}]^{2-}\}$ that contain only diamagnetic species is two. In the light of the above statements, choose the correct answer fr

Chemistry 2026 · Organic Chemistry - Some Basic Principles and Techniques

Identify correct statement from the following: A. Propanal and propanone are functional isomers. B. Ethoxyethane and methoxypropane are metamers. C. But-2-ene shows optical isomerism. D. But-1-ene and but-2-ene are functional isomers. E. Pentane and 2, 2-dimethyl propane are chain isomers. Choose the correct answer from the options given below:

Chemistry 2026 · Biomolecules

Identify the correct statements. A. Arginine and Tryptophan are essential amino acids. B. Histidine does not contain heterocyclic ring in its structure. C. Proline is a six membered cyclic ring amino acid. D. Glycine does not have chiral centre. E. Cysteine has characteristic feature of side chain as $\mathrm{MeS-CH_2-CH_2-}$. Choose the correct answer from the options given below:

Chemistry 2026 · Thermodynamics

Which of the following graphs between pressure ‘P’ versus volume ‘V’ represent the maximum work done?

Chemistry 2026 · Thermodynamics

For the reaction, $N_{2}O_{4} \rightleftharpoons 2NO_{2}$, graph is plotted as shown below. Identify correct statements. A. Standard free energy change for the reaction is $-5.40\text{ kJ mol}^{-1}$. B. As $\Delta G^{\ominus}$ in graph is positive, $N_{2}O_{4}$ will not dissociate into $NO_{2}$ at all. C. Reverse reaction will go to completion. D. When 1 mole of $N_{2}O_{4}$ changes into equilibrium mixture, value of $\Delta G = -0.84\text{ kJ mol}^{-1}$. E. When 2 mole of $NO_{2}$ changes into equilibrium mixture, $\Delta G$ for equilibrium mixture is $-6.24\text{ kJ mol}^{-1}$. {{IMG1}} C

Chemistry 2026 · Structure of Atom

Given below are two statements: Statement I: When an electric discharge is passed through gaseous hydrogen, the hydrogen molecules dissociate and the energetically excited hydrogen atoms produce electromagnetic radiation of discrete frequencies. Statement II: The frequency of second line of Balmer series obtained from $He^{+}$ is equal to that of first line of Lyman series obtained from hydrogen atom. In the light of the above statements, choose the correct answer from the options given below:
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