List of top Questions asked in JEE Main- 2026

For the reaction: \[ R \rightarrow P \] The variation of concentration of reactant \([R]\) with time is shown below. Statements: I. Curve 1 will be observed when order of reaction is 1. II. If curve 2 & curve 3 are observed for \(1^{st}\) order then rate constant for \(3^{rd}\) curve will be greater than rate constant for \(2^{nd}\) curve. III. Decomposition of HI on gold surface represent curve (1). Select the option representing correct set of statements: 

Consider the following setup separated by a semi–permeable membrane (SPM): Left compartment (x): \(K_4[Fe(CN)_6]\) solution \(0.1\,M\), \(100\,ml\) Right compartment (y): \(FeCl_3\) solution \(0.1\,M\), \(100\,ml\) Which of the following is correct for the above figure?

From given data (I) 90.8 lit of \(H_2(g)\) at STP (II) 684 gm of sucrose (III) 2 moles of cyclohexane Correct order of total number of atoms will be
When 3.395 gm \(C_2H_5OH_{(l)}\) is burnt completely, it liberates 101.11 kJ of heat, then find the enthalpy of formation of \(C_2H_5OH_{(l)}\). Given: \(\Delta H_f^\circ\) of \(H_2O_{(l)} = -285.8 \, \text{kJ/mol}\) \(\Delta H_c^\circ\) of graphite \(= -393.5 \, \text{kJ/mol}\)
Which of the following have same radius according to Bohr's theory : (A) Radius of \(1^{st}\) orbit of H-atom.
(B) Radius of \(1^{st}\) orbit of He\(^{+}\).
(C) Radius of \(II^{nd}\) orbit of He\(^{2+}\).
(D) Radius of \(II^{nd}\) orbit of Li\(^{2+}\).
(E) Radius of \(II^{nd}\) orbit of Be\(^{3+}\).
For a given reversible reaction at \(300\,K\): \[ 2\text{N}_2\text{O}_5(g) \rightleftharpoons 4\text{NO}_2(g) + \text{O}_2(g) \] If \( \text{N}_2\text{O}_5 \) is 50% dissociated at 5 bar and 300 K at equilibrium, then find \( \Delta G^\circ \) for the reaction? [Given: \( \log 2 = 0.3,\ \log 7 = 0.84 \)]
20 ml of CH\(_3\)COOH solution is neutralised by 28.08 ml of NaOH. In the 20 ml of same solution 14.04 ml of same NaOH solution is poured, then pH of resultant solution will be: (pKa of CH\(_3\)COOH = 4.75)
Given that: \[ E^\circ_{\text{Fe}^{3+}/\text{Fe}} = -0.036\, \text{V} \quad \text{and} \quad E^\circ_{\text{M}^{x+}/\text{M}} = 0.15\, \text{V} \] A Galvanic cell is formed using above electrodes, whose \( E_{\text{cell}} = 0.2047\, \text{V} \) when reaction quotient of cell reaction is \(10^{-2}\). Find the value of \(x\). [Nearest integer]
The shortest distance between the lines \[ \vec r=\frac13\hat i+2\hat j+\frac83\hat k+\lambda(2\hat i-5\hat j+6\hat k) \] \[ \vec r=\left(-\frac23\hat i-\frac13\hat k\right)+\mu(\hat j-\hat k), \quad \lambda,\mu\in\mathbb R \] is
Let \[ f(x) = \begin{cases} e^{x-1}, & x < 0 \\ x^2 - 5x + 6, & x \ge 0 \end{cases} \] and \( g(x) = f(|x|) + |f(x)| \). If \( \alpha \) = number of points of discontinuity of \( g(x) \) and \( \beta \) = number of points of non-differentiability of \( g(x) \), then \( \alpha + \beta = \)
In the expansion of \[ \left(9x-\frac{1}{3\sqrt{x}}\right)^{18}, \] if the coefficient of the term independent of \(x\) is \(221k\), then the value of \(k\) is:
The number of non-negative integer solutions of the equation \[ a + b + 2c = 22 \] is:
Evaluate \[ (0.2)^{\log_{\sqrt{5}}\alpha} + (0.04)^{\log_{5}\beta} \] if \[ \alpha = \frac{1}{4} + \frac{1}{8} + \frac{1}{16} + \cdots \] \[ \beta = \frac{1}{3} + \frac{1}{9} + \frac{1}{27} + \cdots \]
Manganese forms oxide and fluoride with highest oxidation state. The difference in the highest oxidation state of Mn in the oxide and fluoride is:

Two atoms are bonding along the Z-axis. How will the \( \pi^* \) orbital look like (Z is the internuclear axis)? 

Two strings with lengths \(l_1\) and \(l_2\), and Young's moduli \(Y_1\) and \(Y_2\) are elongated under two weights as shown. Find the ratio \(\Delta l_1 / \Delta l_2\).
Case (1): String has Young's modulus \(Y\), length \(l\), cross–sectional area \(A\) and a mass \(m\) is attached. 
Case (2): String has Young's modulus \(2Y\), length \(0.5l\), cross–sectional area \(A\) and a mass \(3m\) is attached.

Two cars \(A\) and \(B\) are moving on a road with speeds \(100\,\text{km/h}\) and \(80\,\text{km/h}\) respectively. A stone is thrown from car \(B\) with speed \(V\) km/h relative to it. The stone hits car \(A\) with speed \(5\,\text{m/s}\) relative to car \(A\) (ignore gravity). Find \(V\).

Consider a ring of radius \(R\) which rotates about a horizontal axis as shown (axis is tangent to the ring). Find the time period of small oscillations.

List-I presents some physical quantities and List-II presents their dimensions. Match the two lists appropriately. 

P is the point of intersection of the two half-lines \[ x-\sqrt{3}y=\alpha, \quad \alpha>0 \] Points \(A\) and \(B\) lie on these lines at a distance \(\alpha\) from \(P\). If the length of perpendicular from \(P\) on \(AB\) is \(\frac{\alpha}{2}\) and the radius of the circumcircle of \(\triangle PAB\) is \(R\), then find \[ \frac{\alpha^2}{R} \]
P is a point on \[ \frac{x^2}{9}+\frac{y^2}{4}=1 \] as \(P(3\cos\alpha,2\sin\alpha)\). Q is a point on \[ x^2+y^2-14x+14y+82=0 \] R is a point on line \[ x+y=5 \] If the centroid of triangle \(PQR\) is \[ \left(\cos\alpha+2,\;\frac{2\sin\alpha}{3}+3\right) \] find the sum of possible ordinates of \(R\).
If \(\left(2\alpha+1,\;\alpha^2-3\alpha,\;\frac{\alpha-1}{2}\right)\) is the image of \((\alpha,2\alpha,1)\) in the line \[ \frac{x-2}{3}=\frac{y-1}{2}=\frac{z}{1}, \] then the value of \(\alpha\) is:
If \(f(x)=(x-1)^4+1 \quad \forall x\in[1,\infty)\). Statement–1 : \(f(x)=f^{-1}(x)\) has only two solutions. Statement–2 : \(f^{-1}(x+1)=f(x)\) has no solution.
In the expansion of \[ \left(9x-\frac{1}{3\sqrt{x}}\right)^{18} \] if coefficient of the term independent of \(x\) is \(221k\), then the value of \(k\) is
If \(\hat u,\hat v\) are unit vectors and \[ |\hat u\times \hat v|=\frac{\sqrt3}{2} \] and \[ \vec A=\lambda\hat u+\hat v+\hat u\times \hat v \] then find \(\lambda\). (Angle between \(\hat u\) and \(\hat v\) is acute)