List of top Questions asked in JEE Advanced- 2026

As shown in the figure, the resistance of a galvanometer $G$ can be found by the half-deflection method. Here the resistance $R_2$ is adjusted such that when the key $K$ is closed the deflection in the galvanometer becomes half of the value as compared to when $K$ is open. Half-deflection is obtained at $R_2 = 4\ \Omega$ and thus the galvanometer resistance is found to be $6\ \Omega$. In this half-deflection condition the current (in mA) through the resistor $R_1$ is:

Let \[ S=\{1,2,3,\ldots,10\}. \] Consider the set \[ X=\{R : R \text{ is an equivalence relation on } S \text{ such that } R \text{ has exactly } 42 \text{ elements}\}. \] Then the number of elements in $X$ is __________.

The total number of all possible isomers for the square planar complex with formula \[ \mathrm{K[M(NCS)(NO_2)(gly)]} \] is _____.

\[ \mathrm{(M = metal\ ion\ and\ gly = NH_2CH_2COO^-)} \]

In the following reaction sequence, major products X and Y are acyclic monomers.
$\text{CH}_3\text{I} \xrightarrow{\text{1. KCN}}{\text{2. H}_3\text{O}^+, \Delta}{\text{3. Red P, Br}_2}{\text{4. NH}_3\text{ (excess) \text{X} $
$\text{Caprolactam} \xrightarrow{\text{H}_3\text{O}^+, \Delta} \text{Y} $
500 mol of X completely reacts with 500 mol of Y to give 1 mol of a single biodegradable acyclic copolymer Z as the only product. The amount of Z formed in grams is _______.
Given: Atomic mass (in amu): H : 1, C : 12, N : 14, O : 16, Br : 80}

Two volatile liquids A and B form an ideal solution. Consider a 5 molal solution of B in A inside a closed container having a total vapour pressure of 100 mm Hg at 300 K. The vapour pressure of pure A at 300 K is 105 mm Hg. Assume that A and B behave as ideal gases in the vapour phase.
Given: The gas constant $R = 0.08 \,\text{L atm K}^{-1}\text{ mol}^{-1}$
Molar mass of A is $50 \,\text{g mol}^{-1}$
Molar mass of B is $57 \,\text{g mol}^{-1}$
Density of liquid B at $300\,\text{K}$ is $0.5 \,\text{g mL}^{-1}$
$1\,\text{atm} = 760\,\text{mm Hg}$

At 300 K, the ratio of the molar volume of pure B in vapour phase to its molar volume in liquid phase is _______.

Consider that the coordinating atoms of the ligands in cis-[Co(NH$_3$)$_4$Cl$_2$]Cl and mer-[Co(NH$_3$)$_3$Cl$_3$] octahedral complexes are at the vertices of an octahedron. The sum of total number of the triangular faces in both the complexes having one N atom and two Cl atoms at their corners is _______.

Two volatile liquids A and B form an ideal solution. Consider a 5 molal solution of B in A inside a closed container having a total vapour pressure of 100 mm Hg at 300 K. The vapour pressure of pure A at 300 K is 105 mm Hg. Assume that A and B behave as ideal gases in the vapour phase.
Given: The gas constant $R = 0.08 \,\text{L atm K}^{-1}\text{ mol}^{-1}$
Molar mass of A is $50 \,\text{g mol}^{-1}$
Molar mass of B is $57 \,\text{g mol}^{-1}$
Density of liquid B at $300\,\text{K}$ is $0.5 \,\text{g mL}^{-1}$
$1\,\text{atm} = 760\,\text{mm Hg}$
The mole fraction of B in vapour phase which is in equilibrium with this solution is _______.

Consider the following reaction sequence in which $J, K, L$ and $M$ are the major products.

Given:
Atomic mass (in amu): H : $1$, C : $12$, N : $14$, O : $16$, S : $32$, Br : $80$, Ba : $137$

In sulphur estimation by Carius method, the amount of $\text{BaSO}_4$ formed from $3.79\,\text{g}$ of $M$ is _____ g.

Consider the following reaction sequence in which $J, K, L$ and $M$ are the major products.

Given:
Atomic mass (in amu): H : $1$, C : $12$, N : $14$, O : $16$, S : $32$, Br : $80$, Ba : $137$

The volume of $1\,\text{M}$ aqueous $\text{H}_2\text{SO}_4$ required to completely neutralize the ammonia evolved from $5.72\,\text{g}$ of $L$ in Kjeldahl’s method of nitrogen estimation is _____ mL.

The correct statement(s) regarding the periodic properties of elements is(are)

In the following reaction sequence, P, Q, S and T are the major products.

The correct statement(s) about P, Q, S and T is(are)

X$^{a+}$ and Y$^{b+}$ are hydrogen-like species. The wavelength of light absorbed during the transition between the states with principal quantum numbers $n = 1$ and $n = 2$ of X$^{a+}$ is $\lambda$. The wavelength of light absorbed during the transition between the states with principal quantum numbers $n = 2$ and $n = 4$ of Y$^{b+}$ is $9\lambda$. The lowest possible value of $(a+b)$ is _______.

At a given temperature, $0.45\,\text{g}$ of acetic acid in $50\,\text{mL}$ of water is shaken with $1.0\,\text{g}$ of charcoal and the pH of the resulting solution is $3.0$. Assume, the adsorption of acetic acid from the aqueous solution by charcoal follows Freundlich isotherm,

\[ \frac{x}{m} = kC^{1/n} \]
If the plot of $\log_{10}(x/m)$ against $\log_{10} C$ gives a straight line with slope $1$, the value of $k$ in $\text{L mol}^{-1}$ is _______.

Given: The molar mass of acetic acid is $60\,\text{g mol}^{-1}$.
The acid dissociation constant of acetic acid is $1.0 \times 10^{-5}$ at the given temperature.
$x$ is the mass (in grams) of acetic acid adsorbed.
$m$ is the mass (in grams) of charcoal.
$C$ is the equilibrium concentration of acetic acid in the solution after the adsorption is complete.
$k$ and $n$ are constants for acetic acid–charcoal system at the given temperature.

The correct statement(s) regarding sugars is(are):

Given: Specific rotations of L-(-)-glucose and L-(+)-fructose are $-52.5^\circ$ and $+92.5^\circ$, respectively.

In a solvent S, a compound B is partially dissociated into C and D as given below:
B $\rightleftharpoons$ 2C + 2D
B, C and D are non-volatile in nature. The molar mass of B is 10 times the molar mass of S. The standard boiling point and the standard enthalpy of vaporization of S are 400 K and 10R J mol$^{-1}$, respectively (R is the gas constant in J K$^{-1}$ mol$^{-1}$). A solution of B in S with an initial concentration of B as 0.25% (mass/mass) has a boiling point of 408 K at 1 bar pressure. In this solution, the mole percent of B that has been dissociated is _______.

For a first-order reaction R $\rightarrow$ P at a given temperature, $k$ is the rate constant. For this reaction, at the given temperature, the concentrations of R and P at a time $t$ are [R] and [P], respectively. The correct graphical representation(s) for this reaction is(are)

Natural rubber on complete ozonolysis (O$_3$/Zn-H$_2$O) gives compound X as the major product. X gives positive iodoform and Tollen's tests. X on heating with aqueous NaOH gives Y as the major product. Y is

A known artificial sweetener X is composed of 4-chloro-4-deoxy-$\alpha$-D-galactose and 1,6-dichloro-1,6-dideoxy-$\beta$-D-fructose joined by a glycosidic linkage.

Structure of D-galactose is given below:

Correct statement(s) about the compounds P, Q and R is(are)
$ \text{Xe(g)} + \text{F}_2\text{(g)} \xrightarrow{\text{873 K, 7 bar}}{\text{P}} $
(1 : 5 ratio)
$ \text{P} + \text{O}_2\text{F}_2 \xrightarrow{\text{143 K}}{\text{Q}} + \text{O}_2 $
$ \text{Q} + \text{H}_2\text{O} \xrightarrow{\text{complete hydrolysis}}{\text{R}} + \text{HF} $

The correct order of ONO bond angle in the given species is

At 300 K, the molar conductivities of the aqueous solutions of three salts at two different concentrations are given below:

The conductivity of a saturated aqueous solution of AgCl is $1.40 \times 10^{-6}$ S cm$^{-1}$ at 300 K. If the solubility of AgCl in water at 300 K is X mol L$^{-1}$, then log$_{10}$(X$^{-1}$) is
(Assume that AgCl dissolved in water ionizes completely and that the molar conductivity of saturated AgCl solution is equal to its limiting molar conductivity.)}

A uniform circular disk of radius $0.2\,\text{m}$ and mass $1\,\text{kg}$ is pivoted at its top point $C$ such that it can rotate freely around $C$ in the $XY$-plane, as shown in the figure. Initially, when the disk is at rest, a particle of mass $20\,\text{g}$, travelling along negative $x$-direction in the $XY$-plane with speed $100\,\text{ms}^{-1}$, hits the circumference of the disk at a point $P$. After collision the particle moves along negative $y$-direction at a speed of $90\,\text{ms}^{-1}$. (Given: the acceleration due to gravity $g = -10\hat{j}\,\text{ms}^{-2}$)

After the collision the disk starts to rotate around point $C$ in the $XY$-plane. The maximum change in the height (in m) of its center $O$ is:

A container of height $2\,\text{m}$, length $2\,\text{m}$ and breadth $1\,\text{m}$ is made of insulating vertical walls and two large area horizontal metal plates $(M_1 \text{ and } M_2)$ which extend far beyond the vertical walls in all directions. The container is partitioned into two equal chambers with a thin insulating vertical wall. The partition wall contains a small hole of cross-sectional area $\sqrt{10}\,\text{cm}^2$ near its bottom edge. Initially the hole is closed and the left chamber of the container is completely filled with a liquid of dielectric constant $\epsilon_r = 15$ and the right chamber is empty $(\epsilon_r = 1)$. At time $t=0$, the hole is opened and the liquid flows from the left chamber to the right chamber. In both the chambers, the space above the liquid has $\epsilon_r = 1$ and is maintained at atmospheric pressure. The schematic of the container at a time $t>0$ is shown in the figure. [Given: acceleration due to gravity is $10\,\text{ms}^{-2}$.]

The height (in m) of the liquid in left chamber at $t=500\,\text{s}$ is:

Amount of energy loss (in J) in the collision is:

The difference in the capacitance (in F) between the metal plates at $t=0$ and that at $t=500\,\text{s}$ is $(8-n)\epsilon_0$, where $\epsilon_0$ is the permittivity of free space. The value of $n$ is: