JEE Main 2025 — 8 April, Evening Shift

Correct statements for an element with atomic number 9 are

A. There can be 5 electrons for which $\mathrm{m}_{\mathrm{s}}=+\frac{1}{2}$ and 4 electrons for which $m_{s}=-\frac{1}{2}$

B. There is only one electron in $p_{z}$ orbital

C. The last electron goes to orbital with $n=2$ and $I=1$

D. The sum of angular nodes of all the atomic orbitals is 1

Choose the correct answer from the options given below :

Match List-I with List-II :

Choose the correct answer from the options given below

$\mathrm{HA}(\mathrm{aq}) \rightleftharpoons \mathrm{H}^{+}(\mathrm{aq})+\mathrm{A}^{-}(\mathrm{aq})$ The freezing point depression of a 0.1 m aqueous solution of a monobasic

weak acid HA is $0.20^{\circ} \mathrm{C}$. The dissociation constant for the acid is Given: $\mathrm{K}_{\mathrm{f}}\left(\mathrm{H}_{2} \mathrm{O}\right)=1.8 \mathrm{~K} \mathrm{~kg} \mathrm{~mol}^{-1}$,

molality $\equiv$ molarity

Given below are two statements : one is labelled as Statement I and the other is labelled as Statement II:

Statement I: A homoleptic octahedral complex, formed using monodentate ligands, will not show stereoisomers

Statement II: cis and trans platin are heteroleptic complexes of Pd

In the light of the above statements, choose the correct answer from the options given below :

Which of the following binary mixture does not show the behaviour of minimum boiling azeotropes?

Match the List-I with List-II

Choose the correct answer from the options given below:

The correct decreasing order of spin only magnetic moment values (BM) of $\mathrm{Cu}^{+}, \mathrm{Cu}^{2+}, \mathrm{Cr}^{2+}$ and $\mathrm{Cr}^{3+}$ ions is

Choose the correct option for structures of A and B, respectively

What is the correct IUPAC name of

Given below are two statements:

Statement I: $\mathrm{H}_{2} \mathrm{Se}$ is more acidic than $\mathrm{H}_{2} \mathrm{Te}$

Statement II : $\mathrm{H}_{2} \mathrm{Se}$ has higher bond enthalpy for dissociation than $\mathrm{H}_{2} \mathrm{Te}$

In the light of the above statement, choose the correct answer from the options given

In a first order decomposition reaction, the time taken for the decomposition of reactant to one fourth and one eighth of its initial concentration are $t_{1}$ and $t_{2}(s)$, respectively. The ratio $t_{1} / t_{2}$ will be:

On combustion of 0.210 g of an organic compound containing $\mathrm{C}, \mathrm{H}$ and O gave $0.127 \mathrm{~g} \mathrm{H}_{2} \mathrm{O}$ and 0.307 $\mathrm{g} \mathrm{CO}_{2}$. The percentage of hydrogen and oxygen in the given organic compound respectively are:

The number of species from the following that are involved in $s p^{3} d^{2}$ hybridization is $\left[\mathrm{Co}\left(\mathrm{NH}_{3}\right)_{6}\right]^{3+}$,

$\mathrm{SF}_{6},\left[\mathrm{CrF}_{6}\right]^{3-},\left[\mathrm{CoF}_{6}\right]^{3-},\left[\mathrm{Mn}(\mathrm{CN})_{6}\right] 3^{-}$and $\left[\mathrm{MnCl}_{6}\right]^{3-}$

The atomic number of the element from the following with lowest $1^{\text {st }}$ ionisation enthalpy is

Match the List-I with List-II

Choose the correct answer from the options given below:

$A \xrightarrow[\text { (ii) } \mathrm{H}_{3} \mathrm{O}^{+}]{\text {(i) } \mathrm{NaOH}} \mathrm{B} \xrightarrow[\text { (ii) } \mathrm{H}_{2} \mathrm{SO}_{4}, \Delta]{\text { (i } \mathrm{EtOH}} \mathrm{C}$

' A ' shows positive Lassaigne's test for N and its molar mass is 121.

'B' gives effervescence with aq $\mathrm{NaHCO}_{3}$

'C' gives fruity smell

Identify $\mathrm{A}, \mathrm{B}$ and C from the following

Consider the following half cell reaction

The reaction was conducted with the ratio of $\frac{\left[\mathrm{Cr}^{3+}\right]^{2}}{\left[\mathrm{Cr}_{2} \mathrm{O}_{7}^{2-}\right]}=10^{-6}$. The pH value at which the EMF of the half

cell will become zero is $\_\_\_\_\_$ . (nearest integer value)

[Given : standard half cell reduction potential $\left.\mathrm{E}_{\mathrm{Cr}_{2} \mathrm{O}_{7}^{2-}, \mathrm{H}^{+} / \mathrm{Cr}^{3+}}^{0}=1.33 \mathrm{~V}, \frac{2.303 \mathrm{RT}}{\mathrm{F}}=0.059 \mathrm{~V}\right]$

The equilibrium constant for decomposition of $\mathrm{H}_{2} \mathrm{O}(\mathrm{g})$

$\mathrm{H}_{2} \mathrm{O}(\mathrm{g}) \rightleftharpoons \mathrm{H}_{2}(\mathrm{~g})+\frac{1}{2} \mathrm{O}_{2}(\mathrm{~g})\left(\Delta \mathrm{G}^{0}=92.34 \mathrm{~kJ} \mathrm{~mol}^{-1}\right)$ is $8.0 \times 10^{-3}$ at 2300 K and total

pressure at equilibrium is 1 bar. Under this condition, the degree of dissociation ( $\alpha$ ) of water is $\_\_\_\_\_$ $\times 10^{-}$ ${ }^{2}$

(nearest integer value) [Assume $\alpha$ is negligible with respect to 1]

20 mL of sodium iodide solution gave 4.74 g silver iodide when treated with excess of silver nitrate solution. The

molarity of the sodium iodide solution is $\_\_\_\_\_$ M. (Nearest Integer Value)

(Given: $\mathrm{Na}=23, \mathrm{I}=127, \mathrm{Ag}=108, \mathrm{~N}=14, \mathrm{O}=16$ $\mathrm{g} \mathrm{mol}^{-1}$ )

The energy of an electron in first Bohr orbit of H atom is -13.6 eV . The magnitude of energy value of electron in the first excited state of $\mathrm{Be}^{3+}$ is $\_\_\_\_\_$ eV (nearest integer value)

Resonance in $X_{2} Y$ can be represented as

The enthalpy of formation of $X_{2} Y$ $\left(X \equiv X(g)+\frac{1}{2} Y=Y(g) \rightarrow X_{2} Y(g)\right)$ is $80 \mathrm{~kJ} \mathrm{~mol}^{-1}$.

The magnitude of resonance energy of $X_{2} Y$ is $\ldots \mathrm{kJ} \mathrm{mol}^{-1}$ (nearest integer value) Given : Bond energies of

$X \equiv X, X=X, Y=Y$ and $X=Y$ are 940, 410, 500 and $602 \mathrm{~kJ} \mathrm{~mol}^{-1}$ respectively.

Valence $\mathrm{X}: 3, \mathrm{Y}: 2$

Let the ellipse $3 x^{2}+p y^{2}=4$ pass through the centre $C$ of the circle $x^{2}+y^{2}-2 x-4 y-11=0$ of radius $r$. Let $f_{1}, f_{2}$ be the focal distances of the point $C$ on the ellipse. Then $6 f_{1} f_{2}-r$ is equal to

The integral $\int_{-1}^{\frac{3}{2}}\left(\left|\pi^{2} x \sin (\pi x)\right|\right) d x$ is equal to:

The value of

A line passing through the point $P(a, 0)$ makes an acute angle $\alpha$ with the positive $x$-axis. Let this line be rotated about the point $P$ through an angle $\frac{\alpha}{2}$ in the clock-wise direction. If in the new position, the slope of the line is $2-\sqrt{3}$ and its distance from the origin is $\frac{1}{\sqrt{2}}$, then the value of $3 a^{2} \tan ^{2} \alpha-2 \sqrt{3}$ is

Let $A=\left[\begin{array}{ccc}2 & 2+p & 2+p+q\\ 4 & 6+2 p & 8+3 p+2 q\\ 6 & 12+3 p & 20+6 p+3 q\end{array}\right]$. If $\operatorname{det}(\operatorname{adj}(\operatorname{adj}(3 A)))=2^{m} \cdot 3^{n}, m, n \in \mathbb{N}$, then $m+n$ is equal to

Given below are two statements : one is labelled as Statement I and the other is labelled as Statement II:

Statement I: $\lim _{x \rightarrow 0}\left(\frac{\tan ^{-1} x+\log _{e} \sqrt{\frac{1+x}{1-x}}-2 x}{x^{5}}\right)=\frac{2}{5}$

Statement II: $\lim _{x \rightarrow 1}\left(x^{\frac{2}{1-x}}\right)=\frac{1}{e^{2}}$

In the light of the above statements, choose the correct answer from the options given below :

Let $\vec{a}=\hat{i}+2 \hat{j}+\hat{k}$ and $\vec{b}=2 \hat{i}+\hat{j}-\hat{k}$. Let $\hat{c}$ be a unit vector in the plane of the vector $\vec{a}$ and $\vec{b}$ and be perpendicular to $\vec{a}$. Then such a vector $\hat{c}$ is:

Let the value of $\lambda$ for which the shortest distance between the lines $\frac{x-1}{2}=\frac{y-2}{3}=\frac{z-3}{4}$ and

$\frac{x-\lambda}{3}=\frac{y-4}{4}=\frac{z-5}{5}$ is $\frac{1}{\sqrt{6}}$ be $\lambda_{1}$ and $\lambda_{2}$. Then the radius of the circle passing through the points $(0,0)$, ( $\lambda_{1}, \lambda_{2}$ ) and ( $\lambda_{2}, \lambda_{1}$ ) is

Given below are two statements : one is labelled as Statement I and the other is labelled as Statement II:

Let $A=\{0,1,2,3,4,5\}$. Let $R$ be a relation on $A$ defined by $(x, y) \in R$ if and only if $\max \{x, y\} \in\{3,4\}$. Then among the statements

Statement I: The number of elements in $R$ is 18.

Statement II: The relation $R$ is symmetric but neither reflexive nor transitive.

In the light of the above statements, choose the correct answer from the options given below :

If $\frac{1}{1^{4}}+\frac{1}{2^{4}}+\frac{1}{3^{4}}+\ldots \infty=\frac{\pi^{4}}{90}$, $\frac{1}{1^{4}}+\frac{1}{3^{4}}+\frac{1}{5^{4}}+\ldots \infty=\alpha$ $\frac{1}{2^{4}}+\frac{1}{4^{4}}+\frac{1}{6^{4}}+\ldots$

$\infty=\beta$, Then $\frac{\alpha}{\beta}$ is equal to

Let the function $f(x)=\frac{x}{3}+\frac{3}{x}+3, x \neq 0$ be strictly increasing in $\left(-\infty, \alpha_{1}\right) \cup\left(\alpha_{2}, \infty\right)$ and strictly

decreasing in $\left(\alpha_{3}, \alpha_{4}\right) \cup\left(\alpha_{4}, \alpha_{5}\right)$. Then $\sum_{i=1}^{5} \alpha_{i}^{2}$ is equal to

If $A$ and $B$ are two events such that $P(A)=0.7, P(B)$ $=0.4$ and $P(A \cap \bar{B})=0.5$, where $\bar{B}$ denotes the complement of $B$, then $P(B \mid(A \cup \bar{B}))$ is equal to

Let $f(x)=x-1$ and $g(x)=e^{x}$ for $x \in \mathbb{R}$. If $\frac{d y}{d x}=\left(e^{-2 \sqrt{x}} g(f(f(x)))-\frac{y}{\sqrt{x}}\right), y(0)=0$,

then $y(1)$ is

The sum of the squares of the roots of $|x-2|^{2}+|x-2|-2=0$ and the squares of the roots of $x^{2}-2|x-3|-5=0$, is

Let $A=\left\{\theta \in[0,2 \pi]: 1+10 \operatorname{Re}\left(\frac{2 \cos \theta+i \sin \theta}{\cos \theta-3 i \sin \theta}\right)=0\right\}$. Then $\sum_{\theta \in A} \theta^{2}$ is equal to

Let $a$ be the length of a side of a square $O A B C$ with $O$ being the origin. Its side $O A$ makes an acute angle $\alpha$ with the positive $x$-axis and the equations of its diagonals are $(\sqrt{3}+1) x+(\sqrt{3}-1) y=0$ and $(\sqrt{3}-1) x-(\sqrt{3}+1) y+8 \sqrt{3}=0$. Then $a^{2}$ is equal to

Let $f(x)$ be a positive function and $I_{1}=\int_{-\frac{1}{2}}^{1} 2 x f(2 x(1-2 x)) d x$ and $I_{2}=\int_{-1}^{2} f(x(1-x)) d x$.

Then the value of $\frac{I_{2}}{I_{1}}$ is equal to $\_\_\_\_$ .

The number of integral terms in the expansion of $\left(5^{\frac{1}{2}}+7^{\frac{1}{8}}\right)^{1016}$ is :

There are 12 points in a plane, no three of which are in the same straight line, except 5 points which are collinear. Then the total number of triangles that can be formed with the vertices at any three of these 12 points is

Let $\alpha$ be a solution of $x^{2}+x+1=0$, and for some $a$ and $b$ in $\mathbf{R}$,

$\left[\begin{array}{lll}4 & a & b\end{array}\right]\left[\begin{array}{ccc}1 & 16 & 13\\ -1 & -1 & 2\\ -2 & -14 & -8\end{array}\right]=\left[\begin{array}{lll}0 & 0 & 0\end{array}\right]$. If $\frac{4}{\alpha^{4}}+\frac{m}{\alpha^{a}}+\frac{n}{\alpha^{b}}=3$, then $m+n$ is equal to

$\_\_\_\_$ -

The product of the last two digits of $(1919)^{1919}$ is $\_\_\_\_$ -

Let the domain of the function $f(x)=\cos ^{-1}\left(\frac{4 x+5}{3 x-7}\right)$ be $[\alpha, \beta]$ and the domain of

$g(x)=\log _{2}\left(2-6 \log _{27}(2 x\right.$ $+5)$ ) be $(\gamma, \delta)$. Then $|7(\alpha+\beta)+4(\gamma+\delta)|$ is equal to $\_\_\_\_$ .

Let $r$ be the radius of the circle, which touches $x$ axis at point $(a, 0), a<0$ and the parabola $y^{2}=9 x$ at the point $(4,6)$. Then $r$ is equal to $\_\_\_\_$ .

Let the area of the bounded region $\{(x, y): 0 \leq 9 x \leq$ $\left.y^{2}, y \geq 3 x-6\right\}$ be $A$. Then $6 A$ is equal to $\_\_\_\_$ .

Let the area of the triangle formed by the lines $x+$ $2=y-1=z, \frac{x-3}{5}=\frac{y}{-1}=\frac{z-1}{1}$ and

$\frac{x}{-3}=\frac{y-3}{3}=\frac{z-2}{1}$ be $A$. Then $A^{2}$ is equal to $\_\_\_\_$ .

A rod of linear mass density ' $\lambda$ ' and length ' $L$ ' is bent to form a ring of radius ' $R$ '. Moment of inertia of ring about any of its diameter is

In a Young's double slit experiment, the source is white light. One of the slits is covered by red filter and another by a green filter. In this case

Two balls with same mass and initial velocity, are projected at different angles in such a way that maximum height reached by first ball is 8 times higher than that of the second ball. $T_{1}$ and $T_{2}$ are the total flying times of first and second ball, respectively, then the ratio of $T_{1}$ and $T_{2}$ is

For a nucleus of mass number $A$ and radius $R$, the mass density of nucleus can be represented as

Figure shows a current carrying square loop $A B C D$ of edge length is 'a' lying in a plane. If the resistance of the $A B C$ part is $r$ and that of $A D C$ part is $2 r$, then the magnitude of the resultant magnetic field at centre of the square loop is

A convex lens of focal length 30 cm is placed in contact with a concave lens of focal length 20 cm . An object is placed at 20 cm to the left of this lens system. The distance of the image from the lens in cm is $\qquad$ .

The amplitude and phase of a wave that is formed by the superposition of two harmonic travelling waves, $y_{1}$ $(x, t)=4 \sin (k x-\omega t)$ and $y_{2}(x, t)=2$ $\sin \left(k x-\omega t+\frac{2 \pi}{3}\right)$, are : (Take the angular frequency of initial waves same as $\omega$ )

A body of mass 2 kg moving with velocity of $\vec{v}_{\text {in }}=3 \hat{i}+4 \hat{j} \mathrm{~ms}^{-1}$ enters into a constant force field of 6 N directed along positive z -axis. If the body remains in the field for a period of $\frac{5}{3}$ seconds, then velocity of the body when it emerges from force field is :

A quantity $Q$ is formulated as $X^{-2} Y^{+\frac{3}{2}} Z^{-\frac{2}{5}}, X, Y$ and $Z$ are independent parameters which have fractional errors of $0.1,0.2$ and 0.5 , respectively in measurement. The maximum fractional error of $Q$ is

A monoatomic gas having $\gamma=\frac{5}{3}$ is stored in a thermally insulated container and the gas is suddenly compressed to $\left(\frac{1}{8}\right)^{\text {th }}$ of its initial volume. The ratio of final pressure and initial pressure is ( $\gamma$ is the ratio of specific heats of the gas at constant pressure and at constant volume)

Two strings with circular cross section and made of same material are stretched to have same amount of tension. A transverse wave is then made to pass through both the strings. The velocity of the wave in the first string having the radius of cross section $R$ is $v_{1}$, and that in the other string having radius of cross section $R / 2$ is $v_{2}$. Then $\frac{v_{2}}{v_{1}}=$

An infinitely long wire has uniform linear charge density $\lambda=2 \mathrm{nC} / \mathrm{m}$. The net flux through a Gaussian cube of side length $\sqrt{3} \mathrm{~cm}$, if the wire passes through any two corners of the cube, that are maximally displaced from each other, would be $x \mathrm{Nm}^{2} \mathrm{C}^{-1}$, where $x$ is[0pt] [Neglect any edge effects and use $\frac{1}{4 \pi \varepsilon_{0}}=9 \times 10^{9}$ SI units]

A block of mass 2 kg is attached to one end of a massless spring whose other end is fixed at a wall. The spring-mass system moves on a frictionless horizontal table. The spring's natural length is 2 m and spring constant is $200 \mathrm{~N} / \mathrm{m}$. The block is pushed such that the length of the spring becomes 1 m and then released. At distance $x \mathrm{~m}(x<2)$ from the wall, the speed of the block will be

Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R.

Assertion A: Work done in moving a test charge between two points inside a uniformly charged spherical shell is zero, no matter which path is chosen.

Reason $\mathbf{R}$ : Electrostatic potential inside a uniformly charged spherical shell is constant and is same as that on the surface of the shell.

In the light of the above statements, choose the correct answer from the options given below

Two metal spheres of radius $R$ and $3 R$ have same surface charge density $\sigma$. If they are brought in contact and then separated, the surface charge density on smaller and bigger sphere becomes $\sigma_{1}$ and $\sigma_{2}$, respectively. The ratio $\frac{\sigma_{1}}{\sigma_{2}}$ is

The output voltage in the following circuit is (Consider ideal diode case)

Water falls from a height of 200 m into a pool. Calculate the rise in temperature of the water assuming no heat dissipation from the water in the pool. (Take $g=10 \mathrm{~m} / \mathrm{s}^{2}$, specific heat of water $=4200 \mathrm{~J} /(\mathrm{kg}$ K))

A 3 m long wire of radius 3 mm shows an extension of 0.1 mm when loaded vertically by a mass of 50 kg in an experiment to determine Young's modulus. The value of Young's modulus of the wire as per this experiment is $P \times 10^{11} \mathrm{Nm}^{-2}$, where the value of $P$ is: (Take $g=3 \pi \mathrm{~m} / \mathrm{s}^{2}$ )

A concave-convex lens of refractive index 1.5 and the radii of curvature of its surfaces are 30 cm and 20 cm , respectively. The concave surface is upwards and is filled with a liquid of refractive index 1.3. The focal length of the liquid-glass combination will be

Space between the plates of a parallel plate capacitor of plate area $4 \mathrm{~cm}^{2}$ and separation of

$(d) 1.77 \mathrm{~mm}$, is filled with uniform dielectric materials with dielectric constants (3 and 5)as

shown in figure. Another capacitor of capacitance 7.5 pF is connected in parallel with it. The effective

capacitance of this combination is $\qquad$ pF . (Given $\epsilon_{o}=8.85 \times 10^{-12} \mathrm{~F} / \mathrm{m}$ )

An electron is released from rest near an infinite non-conducting sheet of uniform charge density ' $-\sigma$ '. The rate of change of de-Broglie wave length associated with the electron varies inversely as $n^{\text {th }}$ power of time. The numerical value of $n$ is $\qquad$ .

A cube having a side of 10 cm with unknown mass and 200 gm mass were hung at two ends of an uniform rigid rod of 27 cm long. The rod along with masses was placed on a wedge keeping the distance between wedge point and 200 gm weight as 25 cm . Initially the masses were not at balance. A beaker is placed beneath the unknown mass and water is added slowly to it. At given point the masses were in balance and half volume of the unknown mass was inside the water. (Take the density of unknown mass is more than that of the water, the mass did not absorb water and water density is $1 \mathrm{gm} / \mathrm{cm}^{3}$.) The unknown mass is $\qquad$ kg .

A sample of a liquid is kept at 1 atm. It is compressed to 5 atm which leads to change of volume of $0.8 \mathrm{~cm}^{3}$. If the bulk modulus of the liquid is 2 GPa , the initial volume of the liquid was $\qquad$ litre. (Take 1 atm $=10^{5} \mathrm{~Pa}$ )

A thin solid disk of 1 kg is rotating along its diameter axis at the speed of 1800 rpm . By applying an external torque of

$25 \pi \mathrm{Nm}$ for 40s, the speed increases to 2100 rpm . The diameter of the disk is $\qquad$ m.