JEE Main 2025 — 8 Apr Shift 2 (Previous Year Paper)

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

1. A.36✓
2. B.26
3. C.30
4. D.24

Correct answer: A

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

1. A.$3+2\pi$
2. B.$1+3\pi$✓
3. C.$2+3\pi$
4. D.$4+\pi$

Correct answer: B

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

1. A.14
2. B.23
3. C.18
4. D.15✓

Correct answer: D

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

1. A.$6\pi^2$
2. B.$\frac{27}{4}\pi^2$
3. C.$\frac{21}{4}\pi^2$✓
4. D.$8\pi^2$

Correct answer: C

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 vectors $\vec{a}$ and $\vec{b}$ and be perpendicular to $\vec{a}$. Then such a vector $\hat{c}$ is :

1. A.$\frac{1}{\sqrt{3}}(\hat{i}-\hat{j}+\hat{k})$
2. B.$\frac{1}{\sqrt{5}}(\hat{j}-2\hat{k})$
3. C.$\frac{1}{\sqrt{2}}(-\hat{i}+\hat{k})$✓
4. D.$\frac{1}{\sqrt{3}}(-\hat{i}+\hat{j}-\hat{k})$

Correct answer: C

The value of $\cot^{-1}\left(\frac{\sqrt{1+\tan^2(2)}-1}{\tan(2)}\right)-\cot^{-1}\left(\frac{\sqrt{1+\tan^2\left(\frac{1}{2}\right)}+1}{\tan\left(\frac{1}{2}\right)}\right)$ is equal to

1. A.$\pi+\frac{5}{2}$
2. B.$\pi-\frac{5}{2}$✓
3. C.$\pi+\frac{3}{2}$
4. D.$\pi-\frac{3}{2}$

Correct answer: B

Let a be the length of a side of a square OABC with O being the origin. Its side OA makes an acute angle α 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

1. A.24
2. B.48✓
3. C.32
4. D.16

Correct answer: B

Let A = {0, 1, 2, 3, 4, 5}. Let R be a relation on A defined by (x, y) ∈ R if and only if max{x, y} ∈ {3, 4}. Then among the statements (S₁) : The number of elements in R is 18, and (S₂) : The relation R is symmetric but neither reflexive nor transitive

1. A.only ($S_1$) is true
2. B.only ($S_2$) is true✓
3. C.both are true
4. D.both are false

Correct answer: B

Let the values of λ 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

1. A.3
2. B.4
3. C.$\frac{5\sqrt{2}}{3}$✓
4. D.$\frac{\sqrt{2}}{3}$

Correct answer: C

Given below are two statements: Statement I : $\lim_{x\to0}\left(\frac{\tan^{-1}x+\log_e\sqrt{\frac{1+x}{1-x}}-2x}{x^5}\right)=\frac{2}{5}$. Statement II : $\lim_{x\to1}\left(x^{\frac{2}{1-x}}\right)=\frac{1}{e^2}$. In the light of the above statements, choose the correct answer from the options given below

1. A.Statement I is false but Statement II is true
2. B.Both Statement I and Statement II are false
3. C.Both Statement I and Statement II are true✓
4. D.Statement I is true but Statement II is false

Correct answer: C

Let the ellipse $3x^2+py^2=4$ pass through the centre C of the circle $x^2+y^2-2x-4y-11=0$ of radius r. Let $f_1$, $f_2$ be the focal distances of the point C on the ellipse. Then $6f_1f_2-r$ is equal to

1. A.74
2. B.70✓
3. C.78
4. D.68

Correct answer: B

Let $A=\begin{bmatrix}2 & 2+p & 2+p+q\\ 4 & 6+2p & 8+3p+2q\\ 6 & 12+3p & 20+6p+3q\end{bmatrix}$. If det (adj (adj (3A))) = $2^m\cdot3^n$, m, n ∈ N, then m + n is equal to

1. A.24✓
2. B.22
3. C.20
4. D.26

Correct answer: A

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 $P(B|(A\cup\bar{B}))$ is equal to

1. A.$\frac{1}{2}$
2. B.$\frac{1}{6}$
3. C.$\frac{1}{4}$✓
4. D.$\frac{1}{3}$

Correct answer: C

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

1. A.230
2. B.220
3. C.210✓
4. D.200

Correct answer: C

A line passing through the point P(a, 0) makes an acute angle α 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 $3a^2\tan^2\alpha-2\sqrt{3}$ is

1. A.5
2. B.6
3. C.8
4. D.4✓

Correct answer: D

Let f(x) be a positive function and $I_1=\int_{-1/2}^{1}2x\,f(2x(1-2x))dx$ and $I_2=\int_{-1}^{2}f(x(1-x))dx$. Then the value of $\frac{I_2}{I_1}$ is equal to ______

1. A.12
2. B.4✓
3. C.6
4. D.9

Correct answer: B

Let f(x) = x − 1 and $g(x)=e^x$ for x ∈ R. If $\frac{dy}{dx}=\left(e^{-2\sqrt{x}}g(f(f(x)))-\frac{y}{\sqrt{x}}\right)$, y(0) = 0, then y(1) is

1. A.$\frac{2e-1}{e^3}$
2. B.$\frac{e-1}{e^4}$✓
3. C.$\frac{1-e^3}{e^4}$
4. D.$\frac{1-e^2}{e^4}$

Correct answer: B

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

1. A.127
2. B.128✓
3. C.129
4. D.130

Correct answer: B

Let α be a solution of $x^2+x+1=0$, and for some a and b in R, $[4\ a\ b]\begin{bmatrix}1 & 16 & 13\\ -1 & -1 & 2\\ -2 & -14 & -8\end{bmatrix}=[0\ 0\ 0]$. If $\frac{4}{\alpha^4}+\frac{m}{\alpha^a}+\frac{n}{\alpha^b}=3$, then m + n is equal to ______

1. A.3
2. B.8
3. C.7
4. D.11✓

Correct answer: D

Let the function $f(x)=\frac{x}{3}+\frac{3}{x}+3$, x ≠ 0 be strictly increasing in $(-\infty, \alpha_1)\cup(\alpha_2, \infty)$ and strictly decreasing in $(\alpha_3, \alpha_4)\cup(\alpha_4, \alpha_5)$. Then $\sum_{i=1}^{5}\alpha_i^2$ is equal to

1. A.48
2. B.36✓
3. C.28
4. D.40

Correct answer: B

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 ______

Correct answer: 56

Let the area of the bounded region $\{(x, y): 0\le9x\le y^2, y\ge3x-6\}$ be A. Then 6A is equal to ______

Correct answer: 15

The product of the last two digits of $(1919)^{1919}$ is ______

Correct answer: 63

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

Correct answer: 30

Let the domain of the function $f(x)=\cos^{-1}\left(\frac{4x+5}{3x-7}\right)$ be [α, β] and the domain of $g(x)=\log_2(2-6\log_{27}(2x+5))$ be (γ, δ). Then |7(α + β) + 4(γ + δ)| is equal to ______

Correct answer: 96

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 m/s², specific heat of water = 4200 J/(kg K))

1. A.0.48 K✓
2. B.0.36 K
3. C.0.23 K
4. D.0.14 K

Correct answer: A

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 N/m. The block is pushed such that the length of the spring becomes 1 m and then released. At distance x m (x < 2) from the wall, the speed of the block will be

1. A.$10\left[1-(2-x)^2\right]^{3/2}$ m/s
2. B.$10\left[1-(2-x)^2\right]^{1/2}$ m/s✓
3. C.$10\left[1-(2-x)^2\right]^2$ m/s
4. D.$10\left[1-(2-x)^2\right]$ m/s

Correct answer: B

A body of mass 2 kg moving with velocity of $\vec{v}_{in}=3\hat{i}+4\hat{j}$ m$s^{-1}$ enters into a constant force field of 6N 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.

1. A.$3\hat{i}+4\hat{j}+5\hat{k}$✓
2. B.$3\hat{i}+4\hat{j}-5\hat{k}$
3. C.$3\hat{i}+4\hat{j}+\sqrt{5}\hat{k}$
4. D.$4\hat{i}+3\hat{j}+5\hat{k}$

Correct answer: A

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

1. A.0.6
2. B.0.1
3. C.0.8
4. D.0.7✓

Correct answer: D

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

1. A.$\frac{\lambda L^3}{8\pi^2}$✓
2. B.$\frac{\lambda L^3}{16\pi^2}$
3. C.$\frac{\lambda L^3}{4\pi^2}$
4. D.$\frac{\lambda L^3}{12}$

Correct answer: A

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 ______.

1. A.$\frac{60}{7}$
2. B.30
3. C.15✓
4. D.45

Correct answer: C

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

1. A.$A^3$
2. B.Independent of A✓
3. C.$A^{2/3}$
4. D.$A^{1/3}$

Correct answer: B

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 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

1. A.A is true but R is false
2. B.Both A and R are true but R is NOT the correct explanation of A
3. C.Both A and R are true and R is the correct explanation of A✓
4. D.A is false but R is true

Correct answer: C

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

1. A.2 : 1
2. B.$\sqrt{2}$ :1
3. C.$2\sqrt{2}$ :1✓
4. D.4 : 1

Correct answer: C

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

1. A.10 V
2. B.0 V✓
3. C.−5 V
4. D.+5 V

Correct answer: B

Two metal spheres of radius R and 3R have same surface charge density σ. 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

1. A.3✓
2. B.$\frac{1}{9}$
3. C.$\frac{1}{3}$
4. D.9

Correct answer: A

Electric charge is transferred to an irregular metallic disk as shown in figure. If $\sigma_1$, $\sigma_2$, $\sigma_3$ and $\sigma_4$ are charge densities at given points then, choose the correct answer from the options given below: A. $\sigma_1>\sigma_3$; $\sigma_2=\sigma_4$ B. $\sigma_1>\sigma_2$; $\sigma_3>\sigma_4$ C. $\sigma_1>\sigma_3>\sigma_2=\sigma_4$ D. $\sigma_1<\sigma_3<\sigma_2=\sigma_4$ E. $\sigma_1=\sigma_2=\sigma_3=\sigma_4$

1. A.A, B and C Only✓
2. B.A and C Only
3. C.D and E Only
4. D.B and C Only

Correct answer: A

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

1. A.$\frac{700}{11}$ cm
2. B.$\frac{800}{11}$ cm
3. C.$\frac{500}{11}$ cm
4. D.$\frac{600}{11}$ cm✓

Correct answer: D

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

1. A.16
2. B.28
3. C.32✓
4. D.40

Correct answer: C

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

1. A.there shall be an interference pattern for red distinct from that for green.
2. B.there shall be an interference pattern, where each fringe's pattern center is green and outer edges is red.
3. C.there shall be no interference fringes.✓
4. D.there shall be alternate interference fringes of red and green.

Correct answer: C

The amplitude and phase of a wave that is formed by the superposition of two harmonic travelling waves, $y_1(x, t)=4\sin(kx-\omega t)$ and $y_2(x, t)=2\sin\left(kx-\omega t+\frac{2\pi}{3}\right)$, are: (Take the angular frequency of initial waves same as ω)

1. A.$[6, \pi/3]$
2. B.$[\sqrt{3}, \pi/6]$
3. C.$[6, 2\pi/3]$
4. D.$[2\sqrt{3}, \pi/6]$✓

Correct answer: D

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 × $10^{11}$ N$m^{-2}$, where the value of P is: (Take g = 3π m/s²)

1. A.10
2. B.25
3. C.5✓
4. D.2.5

Correct answer: C

An infinitely long wire has uniform linear charge density λ = 2 nC/m. The net flux through a Gaussian cube of side length $\sqrt{3}$ cm, if the wire passes through any two corners of the cube, that are maximally displaced from each other, would be x N$m^2C^{-1}$, where x is: [Neglect any edge effects and use $\frac{1}{4\pi\epsilon_0}$ = 9 × $10^9$ SI units]

1. A.$0.72\pi$
2. B.$1.44\pi$
3. C.$2.16\pi$✓
4. D.$6.48\pi$

Correct answer: C

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

1. A.$\frac{3\pi\mu_0I}{\sqrt{2}a}$
2. B.$\frac{\sqrt{2}\mu_0I}{3\pi a}$✓
3. C.$\frac{2\mu_0I}{3\pi a}$
4. D.$\frac{\mu_0I}{2\pi a}$

Correct answer: B

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 $\frac{v_2}{v_1}$ =

1. A.4
2. B.$\sqrt{2}$
3. C.2✓
4. D.8

Correct answer: C

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 $cm^3$. If the bulk modulus of the liquid is 2 GPa, the initial volume of the liquid was ______ litre. (Take 1 atm = $10^5$ Pa)

Correct answer: 4

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

Correct answer: 2

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 gm/$cm^3$.) The unknown mass is ______ kg.

Correct answer: 3

Space between the plates of a parallel plate capacitor of plate area 4 $cm^2$ and separation of (d) 1.77 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 ______ pF. (Given $\epsilon_0$ = 8.85 × $10^{-12}$ F/m)

Correct answer: 15

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 25π Nm for 40s, the speed increases to 2100 rpm. The diameter of the disk is ______ m.

Correct answer: 40

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

1. A.$C_6H_5OH+C_6H_5NH_2$✓
2. B.$H_2O+CH_3COC_2H_5$
3. C.$CS_2+CH_3COCH_3$
4. D.$CH_3OH+CHCl_3$

Correct answer: A

HA(aq) ⇌ $H^+$(aq) + $A^-$(aq). The freezing point depression of a 0.1 m aqueous solution of a monobasic weak acid HA is 0.20 °C. The dissociation constant for the acid is Given : $K_f(H_2O)$ = 1.8 K kg $mol^{-1}$, molality ≡ molarity

1. A.$1.1\times10^{-2}$
2. B.$1.89\times10^{-1}$
3. C.$1.38\times10^{-3}$✓
4. D.$1.90\times10^{-3}$

Correct answer: C

Choose the correct set of reagents for the following conversion. Ethyl benzene → 4-bromostyrene ($CH=CH_2$ para to Br).

1. A.$Cl_2$/Fe ; $Br_2$/anhy.$AlCl_3$ ; aq. KOH
2. B.$Br_2$/Fe ; $Cl_2$, Δ ; alc.KOH✓
3. C.$Br_2$/anhy.$AlCl_3$ ; $Cl_2$, Δ ; aq. KOH
4. D.$Cl_2$/anhy.$AlCl_3$ ; $Br_2$/Fe ; alc. KOH

Correct answer: B

On combustion 0.210 g of an organic compound containing C, H and O gave 0.127 g $H_2O$ and 0.307 g $CO_2$. The percentages of hydrogen and oxygen in the given organic compound respectively are:

1. A.6.72, 39.87
2. B.6.72, 53.41✓
3. C.7.55, 43.85
4. D.53.41, 39.6

Correct answer: B

1,2-dibromocyclooctane $\xrightarrow{\text{(i) KOH (alc.) (ii) } NaNH_2\ \text{(iii) } Hg^{2+}/H^+\ \text{(iv) Zn–Hg}/H^+}$ P (major product). 'P' is

1. A.Cyclooctane✓
2. B.Cyclooctyne
3. C.Cyclooctanol
4. D.Cyclooctanone

Correct answer: A

Match the LIST-I with LIST-II. LIST-I (Complex/ Species): A. $[Ni(CO)_4]$ B. $[Ni(CN)_4]^{2-}$ C. $[NiCl_4]^{2-}$ D. $[MnBr_4]^{2-}$. LIST-II (Shape & magnetic moment): I. Tetrahedral, 2.8 BM II. Square planar, 0 BM III. Tetrahedral, 0 BM IV. Tetrahedral, 5.9 BM. Choose the correct answer from the options given below:

1. A.A-III, B-IV, C-II, D-I
2. B.A-IV, B-I, C-III, D-II
3. C.A-III, B-II, C-I, D-IV✓
4. D.A-I, B-II, C-III, D-IV

Correct answer: C

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

1. A.35
2. B.19
3. C.32
4. D.87✓

Correct answer: D

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:

1. A.$\frac{4}{3}$
2. B.$\frac{3}{2}$
3. C.$\frac{2}{3}$✓
4. D.$\frac{3}{4}$

Correct answer: C

Match the LIST-I with LIST-II. LIST-I (Reagent): A. Sodium bicarbonate solution B. Neutral ferric chloride C. ceric ammonium nitrate D. alkaline $KMnO_4$. LIST-II (Functional Group detected): I. double bond/ unsaturation II. carboxylic acid III. phenolic - OH IV. alcoholic - OH. Choose the correct answer from the options given below:

1. A.A-II, B-IV, C-III, D-I
2. B.A-II, B-III, C-IV, D-I✓
3. C.A-II, B-III, C-I, D-IV
4. D.A-III, B-II, C-IV, D-I

Correct answer: B

A $\xrightarrow{\text{(i) NaOH; (ii) } H_3O^+}$ B $\xrightarrow{\text{(i) EtOH; (ii) } H_2SO_4, \Delta}$ C. 'A' shows positive Lassaign's test for N and its molar mass is 121. 'B' gives effervescence with aq $NaHCO_3$. 'C' gives fruity smell. Identify A, B and C from the following.

1. A.A = 2-aminobenzaldehyde, B = 2-aminobenzoic acid, C = ethyl 2-(ethylamino)benzoate
2. B.A = 4-aminobenzaldehyde, B = an aldol-type hydroxy-ketone dimer, C = a hemiacetal dimer
3. C.A = benzamide ($C_6H_5CONH_2$), B = benzoic acid, C = ethyl benzoate✓
4. D.A = benzylhydrazine ($C_6H_5CH_2NHNH_2$), B = benzoic acid, C = ethyl benzoate

Correct answer: C

Given below are two statements: Statement I : $H_2Se$ is more acidic than $H_2Te$. Statement II : $H_2Se$ has higher bond enthalpy for dissociation than $H_2Te$. In the light of the above statements, choose the correct answer from the options given below

1. A.Both Statement I and Statement II are true
2. B.Both Statement I and Statement II are false
3. C.Statement I is false but Statement II is true✓
4. D.Statement I is true but Statement II is false

Correct answer: C

Correct statements for an element with atomic number 9 are A. There can be 5 electrons for which $m_s=+\frac{1}{2}$ 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 $l$ = 1. D. The sum of angular nodes of all the atomic orbitals is 1. Choose the correct answer from the options given below:

1. A.A, C and D Only
2. B.C and D Only
3. C.A and C Only✓
4. D.A and B Only

Correct answer: C

What is the correct IUPAC name of [cyclopentene ring bearing OH at one sp³ carbon and an ethyl group on the other sp³ carbon flanking the C=C]?

1. A.1-Ethylcyclopent-2-en-3-ol
2. B.4-Ethyl-1-hydroxycyclopent-2-ene
3. C.1-Ethyl-3-hydroxycyclopent-2-ene
4. D.4-Ethylcyclopent-2-en-1-ol✓

Correct answer: D

Given below are two statements: Statement I : A homoleptic octahedral complex, formed using monodentate ligands, will not show stereoisomerism. 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

1. A.Both Statement I and Statement II are true
2. B.Statement I is true but Statement II is false✓
3. C.Statement I is false but Statement II is true
4. D.Both Statement I and Statement II are false

Correct answer: B

Valine, $H_2N-CH(CH(CH_3)_2)-COOH$, at pH = 2 gives A and at pH = 10 gives B. Choose the correct option for structures of A and B, respectively

1. A.A: $H_2N-CH(iPr)-COO^-$; B: $H_3N^+-CH(iPr)-COOH$
2. B.A: $H_2N-CH(iPr)-COO^-$; B: $H_3N^+-CH(iPr)-COO^-$
3. C.A: $H_3N^+-CH(iPr)-COO^-$; B: $H_3N^+-CH(iPr)-COOH$
4. D.A: $H_3N^+-CH(iPr)-COOH$; B: $H_2N-CH(iPr)-COO^-$✓

Correct answer: D

Which one of the following reactions will not lead to the desired ether formation in major proportion ? (iso-Bu ⇒ isobutyl, sec-Bu ⇒ sec-butyl, nPr ⇒ n-propyl, ᵗBu ⇒ tert-butyl, Et ⇒ ethyl)

1. A.$^tBuO^-Na^++EtBr\to{}^tBu-O-Et$
2. B.Cyclohexyl-$O^-Na^+$ + $CH_3Br$ → cyclohexyl–O–$CH_3$
3. C.$Na^+{}^-O$-Ph + n-PrBr → n-Pr–O–Ph
4. D.iso-Bu$O^-Na^+$ + sec-BuBr → sec-Bu–O–iso-Bu✓

Correct answer: D

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

1. A.$Cr^{2+}>Cr^{3+}>Cu^{2+}>Cu^+$✓
2. B.$Cu^{2+}>Cu^+>Cr^{2+}>Cr^{3+}$
3. C.$Cu^+>Cu^{2+}>Cr^{3+}>Cr^{2+}$
4. D.$Cr^{3+}>Cr^{2+}>Cu^+>Cu^{2+}$

Correct answer: A

Match the LIST-I with LIST-II. LIST-I: A. Carbocation B. C-Free radical C. Nucleophile D. Electrophile. LIST-II: I. Species that can supply a pair of electrons. II. Species that can receive a pair of electrons. III. $sp^2$ hybridized carbon with empty p-orbital. IV. $sp^2/sp^3$ hybridized carbon with one unpaired electron. Choose the correct answer from the options given below:

1. A.A-IV, B-II, C-III, D-I
2. B.A-III, B-IV, C-II, D-I
3. C.A-III, B-IV, C-I, D-II✓
4. D.A-II, B-III, C-I, D-IV

Correct answer: C

When 6-oxoheptanal ($CH_3CO-(CH_2)_4-CHO$) undergoes intramolecular aldol condensation, the major product formed is :

1. A.Cyclohept-2-en-1-one
2. B.2-Methylcyclopent-2-en-1-one
3. C.1-Acetylcyclopentene✓
4. D.Cyclopent-1-ene-1-carbaldehyde with 2-methyl (2-methylcyclopent-1-enecarbaldehyde)

Correct answer: C

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

Correct answer: 1

The equilibrium constant for decomposition of $H_2O$(g) $H_2O(g)\rightleftharpoons H_2(g)+\frac{1}{2}O_2(g)$ (ΔG° = 92.34 kJ $mol^{-1}$) is 8.0 × $10^{-3}$ at 2300 K and total pressure at equilibrium is 1 bar. Under this condition, the degree of dissociation (α) of water is ______ × $10^{-2}$ (nearest integer value). [Assume α is negligible with respect to 1]

Correct answer: 5

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 $Be^{3+}$ is ______ eV (nearest integer value)

Correct answer: 54

Resonance in $X_2Y$ can be represented as $\overset{\ominus}{X}=\overset{\oplus}{X}=Y\leftrightarrow X\equiv\overset{\oplus}{X}-\overset{\ominus}{Y}$. The enthalpy of formation of $X_2Y$ ($X\equiv X(g)+\frac{1}{2}Y=Y(g)\to X_2Y(g)$) is 80 kJ $mol^{-1}$. The magnitude of resonance energy of $X_2Y$ is ______ kJ $mol^{-1}$ (nearest integer value) Given : Bond energies of X≡X, X=X, Y=Y and X=Y are 940, 410, 500 and 602 kJ $mol^{-1}$ respectively. valence X: 3, Y: 2

Correct answer: 98

Consider the following half cell reaction $Cr_2O_7^{2-}(aq)+6e^-+14H^+(aq)\to2Cr^{3+}(aq)+7H_2O(l)$. The reaction was conducted with the ratio of $\frac{[Cr^{3+}]^2}{[Cr_2O_7^{2-}]}=10^{-6}$. The pH value at which the EMF of the half cell will become zero is ______. (nearest integer value) [Given : standard half cell reduction potential $E^\circ_{Cr_2O_7^{2-}, H^+/Cr^{3+}}$ = 1.33V, $\frac{2.303RT}{F}$ = 0.059V.]

Correct answer: 10