List of top Questions asked in JEE Main- 2026

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 kJ $mol^{-1}$.
B. As $\Delta G$ 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 $-6.24 \text{ kJ mol}^{-1}$.

Choose the correct answer from the following.

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 K kg mol$^{-1}$). The molar masses of elements P and Q (in g mol$^{-1}$) respectively, are:

A parallel plate capacitor has capacitance C, when there is vacuum within the parallel plates. A sheet having thickness $ \frac{1}{3}d $ of the separation between the plates and relative permittivity K is introduced between the plates. The new capacitance of the system is:

Two identical thin rods of mass M kg and length L m are connected as shown in figure. Moment of inertia of the combined rod system about an axis passing through point P and perpendicular to the plane of the rods is $\frac{x}{12} ML^2$ kg m$^2$. The value of x is ______ .

A hydrocarbon 'P' ($C_4H_8$) on reaction with HCl gives an optically active compound 'Q' ($C_4H_9Cl$) which on reaction with one mole of ammonia gives compound 'R' ($C_4H_{11}N$). 'R' on diazotization followed by hydrolysis gives 'S'. Identify P, Q, R and S.

Find the volume flow rate in the venturi meter given below in which water is flowing.

Find the concentration of $ \mathrm{X^{2-}} $ at equilibrium in $0.1\,\mathrm{M}$ $ \mathrm{H_2X} $. Given: \[ K_{a1} = 2.5 \times 10^{-7}, \qquad K_{a2} = 1 \times 10^{-13} \]

The value of \[ \frac{{}^{100}C_{50}}{51} + \frac{{}^{100}C_{51}}{52} + \cdots + \frac{{}^{100}C_{100}}{101} \] is:

Find the number of matrices $A$ of order $3\times 2$ whose elements are from the set $\{\pm2,\pm1,0\}$, if $\mathrm{Tr}(A^TA)=5$.

A complex number 'z' satisfy both $|z-6|=5$ & $|z+2-6i|=5$ simultaneously. Find the value of $z^3 + 3z^2 - 15z + 141$.

$1\,\text{g}$ of $ \mathrm{AB_2} $ is dissolved in $50\,\text{g}$ of a solvent such that $ \Delta T_f = 0.689\,\text{K} $. When $1\,\text{g}$ of $ \mathrm{AB} $ is dissolved in $50\,\text{g}$ of the same solvent, $ \Delta T_f = 1.176\,\text{K} $. Find the molar mass of $ \mathrm{AB_2} $. Given $ K_f = 5\,\text{K kg mol}^{-1} $. $(\textit{Report to nearest integer.})$ Both $ \mathrm{AB_2} $ and $ \mathrm{AB} $ are non-electrolytes.

For the given set of measurements, find the relative error. \[ 20.00,\ 19.75,\ 18.25,\ 17.01 \]

If $ A = \{1,2,3,4,5,6\} $ and $ B = \{1,2,3,\ldots,9\} $, then the number of strictly increasing functions $ f : A \to B $ such that $ f(i) \neq i $ for all $ i = 1,2,3,4,5,6 $ is:

A conducting rod of mass $ m $ and length $ l $ is moving on an infinite pair of conducting rails as shown. Conducting rails are connected to a resistance $ R $ at one end. Motion is in the vertical plane and horizontal magnetic field in the region is $ B $. Find the terminal speed of the rod.