JEE Main 2025 — 7 Apr Shift 1 (Previous Year Paper)

The integral $\int_0^{\pi}\frac{(x+3)\sin x}{1+3\cos^2x}dx$ is equal to

1. A.$\frac{\pi}{2\sqrt{3}}(\pi+4)$
2. B.$\frac{\pi}{\sqrt{3}}(\pi+2)$
3. C.$\frac{\pi}{\sqrt{3}}(\pi+1)$
4. D.$\frac{\pi}{3\sqrt{3}}(\pi+6)$✓

Correct answer: D

Let the set of all values of $p\in\mathbf{R}$, for which both the roots of the equation $x^2-(p+2)x+(2p+9)=0$ are negative real numbers, be the interval $(\alpha, \beta]$. Then $\beta-2\alpha$ is equal to

1. A.20
2. B.9
3. C.0
4. D.5✓

Correct answer: D

If for $\theta\in\left[-\frac{\pi}{3}, 0\right]$, the points $(x, y)=\left(3\tan\left(\theta+\frac{\pi}{3}\right), 2\tan\left(\theta+\frac{\pi}{6}\right)\right)$ lie on $xy+\alpha x+\beta y+\gamma=0$, then $\alpha^2+\beta^2+\gamma^2$ is equal to

1. A.96
2. B.75✓
3. C.72
4. D.80

Correct answer: B

Let A be a 3 × 3 matrix such that |adj (adj (adj A))| = 81. If $S=\left\{n\in\mathbf{Z}: \left(|\mathrm{adj}(\mathrm{adj}A)|\right)^{\frac{(n-1)^2}{2}}=|A|^{(3n^2-5n-4)}\right\}$, then $\sum_{n\in S}\left|A^{(n^2+n)}\right|$ is equal to

1. A.820
2. B.866
3. C.732✓
4. D.750

Correct answer: C

$\lim_{x\to0^+}\frac{\tan\left(5(x)^{1/3}\right)\log_e(1+3x^2)}{\left(\tan^{-1}3\sqrt{x}\right)^2\left(e^{5(x)^{4/3}}-1\right)}$ is equal to

1. A.1
2. B.$\frac{5}{3}$
3. C.$\frac{1}{3}$✓
4. D.$\frac{1}{15}$

Correct answer: C

Let x = −1 and x = 2 be the critical points of the function $f(x)=x^3+ax^2+b\log_e|x|+1$, $x\neq0$. Let m and M respectively be the absolute minimum and the absolute maximum values of f in the interval $\left[-2, -\frac{1}{2}\right]$. Then $|M+m|$ is equal to (Take $\log_e2=0.7$) :

1. A.21.1✓
2. B.20.9
3. C.19.8
4. D.22.1

Correct answer: A

Among the statements (S1) : The set $\{z\in\mathbf{C}-\{-i\}: |z|=1$ and $\frac{z-i}{z+i}$ is purely real$\}$ contains exactly two elements, and (S2) : The set $\{z\in\mathbf{C}-\{-1\}: |z|=1$ and $\frac{z-1}{z+1}$ is purely imaginary$\}$ contains infinitely many elements.

1. A.only (S2) is correct✓
2. B.only (S1) is correct
3. C.both are correct
4. D.both are incorrect

Correct answer: A

Let the line L pass through (1, 1, 1) and intersect the lines $\frac{x-1}{2}=\frac{y+1}{3}=\frac{z-1}{4}$ and $\frac{x-3}{1}=\frac{y-4}{2}=\frac{z}{1}$. Then, which of the following points lies on the line L?

1. A.(7, 15, 13)✓
2. B.(10, −29, −50)
3. C.(5, 4, 3)
4. D.(4, 22, 7)

Correct answer: A

Let y = y (x) be the solution curve of the differential equation $x(x^2+e^x)dy+(e^x(x-2)y-x^3)dx=0$, x > 0, passing through the point (1, 0). Then y (2) is equal to

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

Correct answer: A

Let P be the parabola, whose focus is (−2, 1) and directrix is 2x + y + 2 = 0. Then the sum of the ordinates of the points on P, whose abscissa is −2, is

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

Correct answer: D

The remainder when $\left((64)^{(64)}\right)^{(64)}$ is divided by 7 is equal to

1. A.6
2. B.1✓
3. C.4
4. D.3

Correct answer: B

The mean and standard deviation of 100 observations are 40 and 5.1, respectively. By mistake one observation is taken as 50 instead of 40. If the correct mean and the correct standard deviation are $\mu$ and $\sigma$ respectively, then $10(\mu+\sigma)$ is equal to

1. A.451
2. B.445
3. C.447
4. D.449✓

Correct answer: D

Let $C_1$ be the circle in the third quadrant of radius 3, that touches both coordinate axes. Let $C_2$ be the circle with centre (1, 3) that touches $C_1$ externally at the point $(\alpha, \beta)$. If $(\beta-\alpha)^2=\frac{m}{n}$, gcd(m, n) = 1, then m + n is equal to

1. A.9
2. B.31
3. C.22✓
4. D.13

Correct answer: C

Let the system of equations : 2x + 3y + 5z = 9, 7x + 3y − 2z = 8, 12x + 3y − (4 + $\lambda$)z = 16 − $\mu$, have infinitely many solutions. Then the radius of the circle centred at ($\lambda$, $\mu$) and touching the line 4x = 3y is

1. A.$\frac{21}{5}$
2. B.$\frac{7}{5}$✓
3. C.7
4. D.$\frac{17}{5}$

Correct answer: B

From a group of 7 batsmen and 6 bowlers, 10 players are to be chosen for a team, which should include atleast 4 batsmen and atleast 4 bowlers. One batsmen and one bowler who are captain and vice-captain respectively of the team should be included. Then the total number of ways such a selection can be made, is

1. A.165
2. B.135
3. C.155✓
4. D.145

Correct answer: C

If the shortest distance between the lines $\frac{x-1}{2}=\frac{y-2}{3}=\frac{z-3}{4}$ and $\frac{x}{1}=\frac{y}{\alpha}=\frac{z-5}{1}$ is $\frac{5}{\sqrt{6}}$, then the sum of all possible values of $\alpha$ is

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

Correct answer: A

Let the angle $\theta$, $0<\theta<\frac{\pi}{2}$ between two unit vectors $\hat{a}$ and $\hat{b}$ be $\sin^{-1}\left(\frac{\sqrt{65}}{9}\right)$. If the vector $\vec{c}=3\hat{a}+6\hat{b}+9(\hat{a}\times\hat{b})$, then the value of $9(\vec{c}\cdot\hat{a})-3(\vec{c}\cdot\hat{b})$ is

1. A.27
2. B.29✓
3. C.24
4. D.31

Correct answer: B

Let $x_1, x_2, x_3, x_4$ be in a geometric progression. If 2, 7, 9, 5 are subtracted respectively from $x_1, x_2, x_3, x_4$, then the resulting numbers are in an arithmetic progression. Then the value of $\frac{1}{24}(x_1x_2x_3x_4)$ is:

1. A.72
2. B.18
3. C.36
4. D.216✓

Correct answer: D

If the area of the region bounded by the curves $y=4-\frac{x^2}{4}$ and $y=\frac{x-4}{2}$ is equal to $\alpha$, then $6\alpha$ equals

1. A.250✓
2. B.210
3. C.240
4. D.220

Correct answer: A

Let ABC be the triangle such that the equations of lines AB and AC be 3y − x = 2 and x + y = 2, respectively, and the points B and C lie on x-axis. If P is the orthocentre of the triangle ABC, then the area of the triangle PBC is equal to

1. A.8
2. B.4
3. C.6✓
4. D.10

Correct answer: C

Consider the hyperbola $\frac{x^2}{a^2}-\frac{y^2}{b^2}=1$ having one of its focus at P(−3, 0). If the latus ractum through its other focus subtends a right angle at P and $a^2b^2=\alpha\sqrt{2}-\beta$, $\alpha, \beta\in\mathbf{N}$, then $\alpha+\beta$ is ______.

Correct answer: 1944

For $n\ge2$, let $S_n$ denote the set of all subsets of {1, 2, …, n} with no two consecutive numbers. For example {1, 3, 5} ∈ $S_6$, but {1, 2, 4} ∉ $S_6$. Then $n(S_5)$ is equal to ______

Correct answer: 13

The number of points of discontinuity of the function $f(x)=\left[\frac{x^2}{2}\right]-\left[\sqrt{x}\right]$, $x\in[0, 4]$, where [·] denotes the greatest integer function, is ______

Correct answer: 8

The number of relations on the set A = {1, 2, 3}, containing at most 6 elements including (1, 2), which are reflexive and transitive but not symmetric, is ______

Correct answer: 6

The number of singular matrices of order 2, whose elements are from the set {2, 3, 6, 9}, is ______.

Correct answer: 36

A lens having refractive index 1.6 has focal length of 12 cm, when it is in air. Find the focal length of the lens when it is placed in water. (Take refractive index of water as 1.28)

1. A.655 mm
2. B.355 mm
3. C.555 mm
4. D.288 mm✓

Correct answer: D

Uniform magnetic fields of different strengths ($B_1$ and $B_2$), both normal to the plane of the paper exist as shown in the figure. A charged particle of mass m and charge q, at the interface at an instant, moves into the region 2 with velocity v and returns to the interface. It continues to move into region 1 and finally reaches the interface. What is the displacement of the particle during this movement along the interface ? (Consider the velocity of the particle to be normal to the magnetic field and $B_2>B_1$)

1. A.$\frac{mv}{qB_1}\left(1-\frac{B_2}{B_1}\right)\times2$
2. B.$\frac{mv}{qB_1}\left(1-\frac{B_1}{B_2}\right)\times2$✓
3. C.$\frac{mv}{qB_1}\left(1-\frac{B_2}{B_1}\right)$
4. D.$\frac{mv}{qB_1}\left(1-\frac{B_1}{B_2}\right)$

Correct answer: B

The percentage increase in magnetic field (B) when space within a current carrying solenoid is filled with magnesium (magnetic susceptibility $\chi_{Mg}=1.2\times10^{-5}$) is :

1. A.$\frac{5}{6}\times10^{-5}$%
2. B.$\frac{5}{3}\times10^{-5}$%
3. C.$\frac{5}{6}\times10^{-4}$%
4. D.$\frac{6}{5}\times10^{-3}$%✓

Correct answer: D

Two projectiles are fired from ground with same initial speeds from same point at angles (45° + $\alpha$) and (45° − $\alpha$) with horizontal direction. The ratio of their times of flights is

1. A.$\frac{1-\tan\alpha}{1+\tan\alpha}$
2. B.1
3. C.$\frac{1+\tan\alpha}{1-\tan\alpha}$✓
4. D.$\frac{1+\sin2\alpha}{1-\sin2\alpha}$

Correct answer: C

If $\epsilon_0$ denotes the permittivity of free space and $\Phi_E$ is the flux of the electric field through the area bounded by the closed surface, then dimensions of $\left(\epsilon_0\frac{d\phi_E}{dt}\right)$ are that of :

1. A.electric potential
2. B.electric field
3. C.electric current✓
4. D.electric charge

Correct answer: C

For a hydrogen atom, the ratio of the largest wavelength of Lyman series to that of the Balmer series is

1. A.3 : 4
2. B.27 : 5
3. C.5 : 36
4. D.5 : 27✓

Correct answer: D

An ac current is represented as $i=5\sqrt{2}+10\cos\left(650\pi t+\frac{\pi}{6}\right)$ Amp. The r.m.s value of the current is

1. A.50 Amp
2. B.10 Amp✓
3. C.$5\sqrt{2}$ Amp
4. D.100 Amp

Correct answer: B

A wire of resistance R is bent into a triangular pyramid as shown in figure with each segment having same length. The resistance between points A and B is R/n. The value of n is :

1. A.16
2. B.14
3. C.10
4. D.12✓

Correct answer: D

In the following circuit, the reading of the ammeter will be (Take Zener breakdown voltage = 4 V)

1. A.80 mA
2. B.10 mA✓
3. C.24 mA
4. D.60 mA

Correct answer: B

A particle of charge q, mass m and kinetic energy E enters in magnetic field perpendicular to its velocity and undergoes a circular arc of radius (r). Which of the following curves represents the variation of r with E?

1. A.r increases as a concave-down curve from the origin (√E shape)✓
2. B.r increases as a concave-up curve
3. C.r increases linearly with E
4. D.r decreases with E

Correct answer: A

Two wires A and B are made of same material having ratio of lengths $\frac{L_A}{L_B}=\frac{1}{3}$ and their diameters ratio $\frac{d_A}{d_B}=2$. If both the wires are stretched using same force, what would be the ratio of their respective elongations ?

1. A.1:12✓
2. B.3:4
3. C.1:6
4. D.1:3

Correct answer: A

In a hydrogen like ion, the energy difference between the $2^{nd}$ excitation energy state and ground is 108.8 eV. The atomic number of the ion is:

1. A.1
2. B.2
3. C.3✓
4. D.4

Correct answer: C

A rod of length 5 L is bent right angle keeping one side length as 2 L. The position of the centre of mass of the system: (Consider L = 10 cm)

1. A.$4\hat{i}+9\hat{j}$✓
2. B.$5\hat{i}+8\hat{j}$
3. C.$3\hat{i}+7\hat{j}$
4. D.$2\hat{i}+3\hat{j}$

Correct answer: A

Two charges $q_1$ and $q_2$ are separated by a distance of 30 cm. A third charge $q_3$ initially at 'C' as shown in the figure, is moved along the circular path of radius 40 cm from C to D. If the difference in potential energy due to movement of $q_3$ from C to D is given by $\frac{q_3K}{4\pi\epsilon_0}$, the value of K is:

1. A.8$q_1$
2. B.8$q_2$✓
3. C.6$q_2$
4. D.6$q_1$

Correct answer: B

Two plane polarized light waves combine at a certain point whose electric field components are $E_1=E_0\sin\omega t$, $E_2=E_0\sin\left(\omega t+\frac{\pi}{3}\right)$. Find the amplitude of the resultant wave.

1. A.1.7 $E_0$✓
2. B.0.9 $E_0$
3. C.3.4 $E_0$
4. D.$E_0$

Correct answer: A

Match the LIST-I with LIST-II. LIST-I: A. Triatomic rigid gas B. Diatomic non-rigid gas C. Monoatomic gas D. Diatomic rigid gas. LIST-II: I. $\frac{C_p}{C_v}=\frac{5}{3}$ II. $\frac{C_p}{C_v}=\frac{7}{5}$ III. $\frac{C_p}{C_v}=\frac{4}{3}$ IV. $\frac{C_p}{C_v}=\frac{9}{7}$. Choose the correct answer from the options given below:

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

Correct answer: A

A cubic block of mass m is sliding down on an inclined plane at 60° with an acceleration of $\frac{g}{2}$, the value of coefficient of kinetic friction is

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

Correct answer: B

Two thin convex lenses of focal lengths 30 cm and 10 cm are placed coaxially, 10 cm apart. The power of this combination is:

1. A.10 D✓
2. B.5 D
3. C.1 D
4. D.20 D

Correct answer: A

Two harmonic waves moving in the same direction superimpose to form a wave x = a cos (1.5t) cos (50.5t) where t is in seconds. Find the period with which they beat. (close to nearest integer)

1. A.2 s✓
2. B.4 s
3. C.6 s
4. D.1 s

Correct answer: A

An object of mass 1000 g experiences a time dependent force $\vec{F}=(2t\hat{i}+3t^2\hat{j})$ N. The power generated by the force at time t is:

1. A.($3t^3+5t^5$) W
2. B.($2t^3+3t^5$) W✓
3. C.($2t^2+18t^3$) W
4. D.($2t^2+3t^3$) W

Correct answer: B

An ideal gas has undergone through the cyclic process as shown in the figure. Work done by the gas in the entire cycle is ______ $\times10^{-1}$ J. (Take $\pi$ = 3.14)

Correct answer: 314

A wire of length 10 cm and diameter 0.5 mm is used in a bulb. The temperature of the wire is 1727°C and power radiated by the wire is 94.2 W. Its emissivity is $\frac{x}{8}$ where x = ______. (Given $\sigma=6.0\times10^{-8}$ W $m^{-2}K^{-4}$, $\pi$ = 3.14 and assume that the emissivity of wire material is same at all wavelength.)

Correct answer: 5

For ac circuit shown in figure, R = 100 kΩ and C = 100 pF and the phase difference between $V_{in}$ and $(V_B-V_A)$ is 90°. The input signal frequency is $10^x$ rad/sec, where 'x' is ______.

Correct answer: 5

A, B and C are disc, solid sphere and spherical shell respectively with same radii and masses. These masses are placed as shown in figure. The moment of inertia of the given system about PQ axis is $\frac{x}{15}$I, where I is the moment of inertia of the disc about its diameter. The value of x is ______.

Correct answer: 199

A container contains a liquid with refractive index of 1.2 up to a height of 60 cm and another liquid having refractive index 1.6 is added to height H above first liquid. If viewed from above, the apparent shift in the position of bottom of container is 40 cm. The value of H is ______ cm. (Consider liquids are immisible)

Correct answer: 80

Which of the following amine (s) show (s) positive carbylamine test? A. aniline B. $(CH_3)_2NH$ C. $CH_3NH_2$ D. $(CH_3)_3N$ E. N-methylaniline. Choose the correct answer from the options given below:

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

Correct answer: D

The group 14 elements A and B have the first ionisation enthalpy values of 708 and 715 kJ $mol^{-1}$ respectively. The above values are lowest among their group members. The nature of their ions $A^{2+}$ and $B^{4+}$ respectively is

1. A.oxidising and reducing
2. B.both reducing
3. C.both oxidising
4. D.reducing and oxidising✓

Correct answer: D

Given below are two statements: Statement I: D-(+)-glucose + D-(+) fructose $\xrightarrow{-H_2O}$ Sucrose; sucrose $\xrightarrow{\text{hydrolysis}}$ D-(+) glucose + D-(+) fructose. Statement II: Invert sugar is formed during sucrose hydrolysis. In the light of the above statements, choose the correct answer from the options given below

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

Correct answer: D

Which of the following compounds is least likely to give effervescence of $CO_2$ in presence of aq. $NaHCO_3$ ?

1. A.3-Nitrobenzoic acid
2. B.2,4,6-Trinitrophenol (picric acid)
3. C.3-Nitrophenol✓
4. D.Anilinium chloride ($PhNH_3^+Cl^-$)

Correct answer: C

The reactions which cannot be applied to prepare an alkene by elimination, are A. 1-bromo-2-methylcyclohexane + NaOEt B. $CH_3-CH_2-CH(Br)-CH_3$ + KOH (aq) C. $(CH_3)_3C-Br$ + NaOMe D. Cyclohexanol + $Na_2Cr_2O_7/H_2SO_4$ E. $(CH_3)_3C-OH$ + Cu, 573 K. Choose the correct answer from the options given below:

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

Correct answer: C

An aqueous solution of HCl with pH 1.0 is diluted by adding equal volume of water (ignoring dissociation of water). The pH of HCl solution would (Given log 2 = 0.30)

1. A.reduce to 0.5
2. B.remain same
3. C.increase to 1.3✓
4. D.increase to 2

Correct answer: C

Total enthalpy change for freezing of 1 mol of water at 10°C to ice at −10°C is ______ (Given: $\Delta_{fus}H$ = x kJ/mol, $C_p[H_2O(l)]$ = y J $mol^{-1}K^{-1}$, $C_p[H_2O(s)]$ = z J $mol^{-1}K^{-1}$)

1. A.10(100x + y + z)
2. B.x − 10y − 10z
3. C.−10(100x + y + z)✓
4. D.−x − 10y − 10z

Correct answer: C

Given below are two statements: Statement I: Dimethyl ether is completely soluble in water. However, diethyl ether is soluble in water to a very small extent. Statement II: Sodium metal can be used to dry diethyl ether and not ethyl alcohol. In the light of given statements, choose the correct answer from the options given below

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

Correct answer: B

Given below are two statements: Statement I: Ozonolysis followed by treatment with Zn, $H_2O$ of cis-2-butene gives ethanal. Statement II: The product obtained by ozonolysis followed by treatment with Zn, $H_2O$ of 3, 6-dimethyloct-4-ene has no chiral carbon atom. 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.Both Statement I and Statement II are False
4. D.Statement I is false but Statement II are true

Correct answer: B

Given below are two statements: Statement I: Mohr's salt is composed of only three types of ions-ferrous, ammonium and sulfate. Statement II: If the molar conductance at infinite dilution for ferrous, ammonium and sulfate ions are $x_1$, $x_2$ and $x_3$ S $cm^2$ $mol^{-1}$, respectively then the molar conductance for Mohr's salt solution at infinite dilution would be given by $x_1+x_2+2x_3$. In the light of the given statements, choose the correct answer from the options given below:

1. A.Both Statements I and Statement II are false
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 Statements I and Statement II are true

Correct answer: B

Reaction A(g) → 2B(g) + C(g) is a first order reaction. It was started with pure A. t/min = 10: pressure of system 160 mm Hg; t = ∞: 240 mm Hg. Which of the following option is incorrect?

1. A.The reaction never goes to completion
2. B.Rate constant of the reaction is 1.693 $min^{-1}$✓
3. C.Initial pressure of A is 80 mm Hg
4. D.Partial pressure of A after 10 minute is 40 mm Hg

Correct answer: B

The number of valence electrons present in the metal among Cr, Co, Fe and Ni which has the lowest enthalpy of atomisation is

1. A.6✓
2. B.9
3. C.8
4. D.10

Correct answer: A

An octahedral complex having molecular composition $Co\cdot5NH_3\cdot Cl\cdot SO_4$ has two isomers A and B. The solution of A gives a white precipitate with $AgNO_3$ solution and the solution of B gives white precipitate with $BaCl_2$ solution. The type of isomerism exhibited by the complex is,

1. A.Ionisation isomerism✓
2. B.Co-ordinate isomerism
3. C.Linkage isomerism
4. D.Geometrical isomerism

Correct answer: A

At the sea level, the dry air mass percentage composition is given as nitrogen gas: 70.0, oxygen gas: 27.0 and argon gas: 3.0. If total pressure is 1.15 atm, then calculate the ratio of following respectively: (i) partial pressure of nitrogen gas to partial pressure of oxygen gas (ii) partial pressure of oxygen gas to partial pressure of argon gas (Given: Molar mass of N, O and Ar are 14, 16 and 40 g $mol^{-1}$ respectively.)

1. A.2.59, 11.85
2. B.5.46, 17.8
3. C.2.96, 11.2✓
4. D.4.26, 19.3

Correct answer: C

Which of the following is the correct IUPAC name of given organic compound (X)? [structure: $CH_3-CH=C(CH_3)-CH_2Br$]

1. A.2-Bromo-2-methylbut-2-ene
2. B.3-Bromo-3-methylprop-2-ene
3. C.4-Bromo-3-methylbut-2-ene
4. D.1-Bromo-2-methylbut-2-ene✓

Correct answer: D

[Visible spectrum 400–750 nm shown.] Which of the following statements are correct, if the threshold frequency of caesium is $5.16\times10^{14}$ Hz? A. When Cs is placed inside a vacuum chamber with an ammeter connected to it and yellow light is focused on Cs, the ammeter shows the presence of current. B. When the brightness of the yellow light is dimmed, the value of the current in the ammeter is reduced. C. When a red light is used instead of the yellow light, the current produced is higher with respect to the yellow light. D. When a blue light is used, the ammeter shows the formation of current. E. When a white light is used. the ammeter shows formation of current. Choose the correct answer from the options given below:

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

Correct answer: C

When a salt is treated with sodium hydroxide solution it gives gas X. On passing gas X through reagent Y a brown coloured precipitate is formed. X and Y respectively, are

1. A.X = $NH_3$ and Y = $K_2HgI_4$ + KOH✓
2. B.X = HCl and Y = $NH_4Cl$
3. C.X = $NH_3$ and Y= HgO
4. D.X = $NH_4Cl$ and Y = KOH

Correct answer: A

Match the LIST-I with LIST-II. LIST-I (Molecule / ion): A. $ICl_2^-$ B. $H_2O$ C. $SO_2$ D. $XeF_4$. LIST-II (Bond pair : lone pair on the central atom): I. 4 : 2 II. 4 : 1 III. 2 : 3 IV. 2 : 2. Choose the correct answer from the options given below:

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

Correct answer: C

The first transition series metal 'M' has the highest enthalpy of atomisation in its series. One of its aquated ion ($M^{n+}$) exists in green colour. The nature of the oxide formed by the above $M^{n+}$ ion is:

1. A.basic✓
2. B.amphoteric
3. C.neutral
4. D.acidic

Correct answer: A

A person's wound was exposed to some bacteria and then bacterial growth started to happen at the same place. The wound was later treated with some antibacterial medicine and the rate of bacterial decay(r) was found to be proportional with the square of the existing number of bacteria at any instance. Which of the following set of graphs correctly represents the 'before' and 'after' situation of the application of the medicine? [Given: N = No. of bacteria, t = time, bacterial growth follows $1^{st}$ order kinetics.]

1. A.Before: N/N₀ rises exponentially from 1; After: r decreases with N (hyperbola-like)
2. B.Before: N/N₀ rises exponentially from 1; After: r increases linearly with N
3. C.Before: N/N₀ rises exponentially from 1; After: r increases parabolically (∝ N²) from the origin✓
4. D.Before: N/N₀ rises from 0; After: r rises from a non-zero intercept

Correct answer: C

An organic compound weighing 500 mg, produced 220 mg of $CO_2$, on complete combustion. The percentage composition of carbon in the compound is ______%. (nearest integer) (Given molar mass in g $mol^{-1}$ of C:12, O:16)

Correct answer: 12

Thyroxine, the hormone has given below structure [3,5,3′,5′-tetraiodothyronine: HO–C₆H₂I₂–O–C₆H₂I₂–CH₂–CH(NH₂)–COOH]. The percentage of iodine in thyroxine is ______%. (nearest integer) (Given molar mass in g $mol^{-1}$ C:12, H:1, O:16, N:14, I:127)

Correct answer: 65

1 Faraday electricity was passed through $Cu^{2+}$ (1.5 M, 1 L)/Cu and 0.1 Faraday was passed through $Ag^+$ (0.2 M, 1 L)/Ag electrolytic cells. After this the two cells were connected as shown below to make an electrochemical cell. The emf of the cell thus formed at 298 K is ______ mV (nearest integer) Given : $E^\circ_{Cu^{2+}/Cu}$ = 0.34 V, $E^\circ_{Ag^+/Ag}$ = 0.8 V, $\frac{2.303RT}{F}$ = 0.06V

Correct answer: 400

The percentage dissociation of a salt ($MX_3$) solution at given temperature (van't Hoff factor i = 2) is ______ %(Nearest integer)

Correct answer: 33

The number of paramagnetic complexes among $[FeF_6]^{3-}$, $[Fe(CN)_6]^{3-}$, $[Mn(CN)_6]^{3-}$, $[Co(C_2O_4)_3]^{3-}$, $[MnCl_6]^{3-}$, and $[CoF_6]^{3-}$, which involved $d^2sp^3$ hybridization is ______

Correct answer: 2