JEE Main 2025 — 28 Jan Shift 1 (Previous Year Paper)

If $f(x)=\frac{2^x}{2^x+\sqrt{2}}$, $x\in\mathbf{R}$, then $\sum_{k=1}^{81}f\left(\frac{k}{82}\right)$ is equal to

1. A.$\frac{81}{2}$✓
2. B.41
3. C.82
4. D.$81\sqrt{2}$

Correct answer: A

If $\int_{-\pi/2}^{\pi/2}\frac{96x^2\cos^2x}{(1+e^x)}dx=\pi(\alpha\pi^2+\beta)$, $\alpha, \beta\in\mathbf{Z}$, then $(\alpha+\beta)^2$ equals

1. A.144
2. B.100✓
3. C.196
4. D.64

Correct answer: B

Let the equation of the circle, which touches x-axis at the point (a, 0), a > 0 and cuts off an intercept of length b on y-axis be $x^2+y^2-\alpha x+\beta y+\gamma=0$. If the circle lies below x-axis, then the ordered pair $(2a, b^2)$ is equal to

1. A.$(\alpha, \beta^2-4\gamma)$✓
2. B.$(\gamma, \beta^2+4\alpha)$
3. C.$(\gamma, \beta^2-4\alpha)$
4. D.$(\alpha, \beta^2+4\gamma)$

Correct answer: A

Let for some function $y=f(x)$, $\int_0^xtf(t)dt=x^2f(x)$, x > 0 and f(2) = 3. Then f(6) is equal to

1. A.6
2. B.1✓
3. C.3
4. D.2

Correct answer: B

Let A (x, y, z) be a point in xy- plane, which is equidistant from three points (0, 3, 2), (2, 0, 3) and (0, 0, 1). Let B = (1, 4, −1) and C = (2, 0, −2). Then among the statements (S1) : $\triangle ABC$ is an isosceles right angled triangle, and (S2) : the area of $\triangle ABC$ is $\frac{9\sqrt{2}}{2}$,

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

Correct answer: B

The relation R = {(x, y) : x, y ∈ Z and x + y is even} is:

1. A.an equivalence relation✓
2. B.symmetric and transitive but not reflexive
3. C.reflexive and symmetric but not transitive
4. D.reflexive and transitive but not symmetric

Correct answer: A

$\cos\left(\sin^{-1}\frac{3}{5}+\sin^{-1}\frac{5}{13}+\sin^{-1}\frac{33}{65}\right)$ is equal to:

1. A.1
2. B.$\frac{33}{65}$
3. C.0✓
4. D.$\frac{32}{65}$

Correct answer: C

The sum of all local minimum values of the function $f(x)=\begin{cases}1-2x, & x<-1\\ \frac{1}{3}(7+2|x|), & -1\le x\le2\\ \frac{11}{18}(x-4)(x-5), & x>2\end{cases}$ is

1. A.$\frac{131}{72}$
2. B.$\frac{167}{72}$
3. C.$\frac{157}{72}$✓
4. D.$\frac{171}{72}$

Correct answer: C

The sum, of the squares of all the roots of the equation $x^2+|2x-3|-4=0$, is

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

Correct answer: B

Let ${}^nC_{r-1}=28$, ${}^nC_r=56$ and ${}^nC_{r+1}=70$. Let A (4cost, 4sint), B (2sint, −2cost) and C $(3r-n, r^2-n-1)$ be the vertices of a triangle ABC, where t is a parameter. If $(3x-1)^2+(3y)^2=\alpha$, is the locus of the centroid of triangle ABC, then $\alpha$ equals

1. A.20✓
2. B.8
3. C.6
4. D.18

Correct answer: A

Three defective oranges are accidently mixed with seven good ones and on looking at them, it is not possible to differentiate between them. Two oranges are drawn at random from the lot. If x denote the number of defective oranges, then the variance of x is

1. A.14/25
2. B.18/25
3. C.26/75
4. D.28/75✓

Correct answer: D

Let $f:\mathbf{R}\to\mathbf{R}$ be a function defined by $f(x)=(2+3a)x^2+\left(\frac{a+2}{a-1}\right)x+b$, $a\neq1$. If $f(x+y)=f(x)+f(y)+1-\frac{2}{7}xy$, then the value of $28\sum_{i=1}^{5}|f(i)|$ is

1. A.545
2. B.675✓
3. C.715
4. D.735

Correct answer: B

Two number $k_1$ and $k_2$ are randomly chosen from the set of natural numbers. Then, the probability that the value of $i^{k_1}+i^{k_2}$, $(i=\sqrt{-1})$ is non-zero, equals

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

Correct answer: A

If the image of the point (4, 4, 3) in the line $\frac{x-1}{2}=\frac{y-2}{1}=\frac{z-1}{3}$ is $(\alpha, \beta, \gamma)$, then $\alpha+\beta+\gamma$ is equal to

1. A.9✓
2. B.7
3. C.12
4. D.8

Correct answer: A

The area (in sq. units) of the region $\{(x, y): 0\le y\le2|x|+1, 0\le y\le x^2+1, |x|\le3\}$ is

1. A.$\frac{80}{3}$
2. B.$\frac{64}{3}$✓
3. C.$\frac{32}{3}$
4. D.$\frac{17}{3}$

Correct answer: B

The number of different 5 digit numbers greater than 50000 that can be formed using the digits 0, 1, 2, 3, 4, 5, 6, 7, such that the sum of their first and last digits should not be more than 8, is

1. A.4608
2. B.5719
3. C.4607✓
4. D.5720

Correct answer: C

Let $T_r$ be the $r^{th}$ term of an A.P. If for some m, $T_m=\frac{1}{25}$, $T_{25}=\frac{1}{20}$, and $20\sum_{r=1}^{25}T_r=13$, then $5m\sum_{r=m}^{2m}T_r$ is equal to

1. A.126✓
2. B.98
3. C.142
4. D.112

Correct answer: A

Let $\langle a_n\rangle$ be a sequence such that $a_0=0$, $a_1=\frac{1}{2}$ and $2a_{n+2}=5a_{n+1}-3a_n$, n = 0, 1, 2, 3, .... Then $\sum_{k=1}^{100}a_k$ is equal to

1. A.$3a_{99}-100$
2. B.$3a_{100}-100$✓
3. C.$3a_{100}+100$
4. D.$3a_{99}+100$

Correct answer: B

Let ABCD be a trapezium whose vertices lie on the parabola $y^2=4x$. Let the sides AD and BC of the trapezium be parallel to y-axis. If the diagonal AC is of length $\frac{25}{4}$ and it passes through the point (1, 0), then the area of ABCD is

1. A.$\frac{75}{8}$
2. B.$\frac{25}{2}$
3. C.$\frac{125}{8}$
4. D.$\frac{75}{4}$✓

Correct answer: D

Let O be the origin, the point A be $z_1=\sqrt{3}+2\sqrt{2}i$, the point B ($z_2$) be such that $\sqrt{3}|z_2|=|z_1|$ and $\arg(z_2)=\arg(z_1)+\frac{\pi}{6}$. Then

1. A.area of triangle ABO is $\frac{11}{4}$
2. B.ABO is a scalene triangle
3. C.area of triangle ABO is $\frac{11}{\sqrt{3}}$
4. D.ABO is an obtuse angled isosceles triangle✓

Correct answer: D

Let $f(x)=\begin{cases}3x, & x<0\\ \min\{1+x+[x], x+2[x]\}, & 0\le x\le2\\ 5, & x>2\end{cases}$, where [.] denotes greatest integer function. If $\alpha$ and $\beta$ are the number of points, where f is not continuous and is not differentiable, respectively, then $\alpha+\beta$ equals ______.

Correct answer: 5

Let $\vec{a}=\hat{i}+\hat{j}+\hat{k}$, $\vec{b}=2\hat{i}+2\hat{j}+\hat{k}$ and $\vec{d}=\vec{a}\times\vec{b}$. If $\vec{c}$ is a vector such that $\vec{a}\cdot\vec{c}=|\vec{c}|$, $|\vec{c}-2\vec{a}|^2=8$ and the angle between $\vec{d}$ and $\vec{c}$ is $\frac{\pi}{4}$, then $|10-3\vec{b}\cdot\vec{c}|+|\vec{d}\times\vec{c}|^2$ is equal to ______.

Correct answer: 6

Let $E_1$: $\frac{x^2}{9}+\frac{y^2}{4}=1$ be an ellipse. Ellipses $E_i$'s are constructed such that their centres and eccentricities are same as that of $E_1$, and the length of minor axis of $E_i$ is the length of major axis of $E_{i+1}$ ($i\ge1$). If $A_i$ is the area of the ellipse $E_i$, then $\frac{5}{\pi}\left(\sum_{i=1}^{\infty}A_i\right)$, is equal to ______.

Correct answer: 54

If $\alpha=1+\sum_{r=1}^{6}(-3)^{r-1}\,{}^{12}C_{2r-1}$, then the distance of the point $(12, \sqrt{3})$ from the line $\alpha x-\sqrt{3}y+1=0$ is ______.

Correct answer: 5

Let M denote the set of all real matrices of order 3 × 3 and let S = {−3, −2, −1, 1, 2}. Let $S_1=\{A=[a_{ij}]\in M: A=A^T$ and $a_{ij}\in S, \forall i, j\}$, $S_2=\{A=[a_{ij}]\in M: A=-A^T$ and $a_{ij}\in S, \forall i, j\}$, $S_3=\{A=[a_{ij}]\in M: a_{11}+a_{22}+a_{33}=0$ and $a_{ij}\in S, \forall i, j\}$. If $n(S_1\cup S_2\cup S_3)=125\alpha$, then $\alpha$ equals ______.

Correct answer: 1613

Due to presence of an em-wave whose electric component is given by $E=100\sin(\omega t-kx)$ N$C^{-1}$, a cylinder of length 200 cm holds certain amount of em-energy inside it. If another cylinder of same length but half diameter than previous one holds same amount of em-energy, the magnitude of the electric field of the corresponding em-wave should be modified as

1. A.25 sin($\omega t$−kx) N$C^{-1}$
2. B.50 sin($\omega t$−kx) N$C^{-1}$
3. C.400 sin($\omega t$−kx) N$C^{-1}$
4. D.200 sin($\omega t$−kx) N$C^{-1}$✓

Correct answer: D

In the experiment for measurement of viscosity '$\eta$' of given liquid with a ball having radius R, consider following statements. A. Graph between terminal velocity V and R will be a parabola. B. The terminal velocities of different diameter balls are constant for a given liquid. C. Measurement of terminal velocity is dependent on the temperature. D. This experiment can be utilized to assess the density of a given liquid. E. If balls are dropped with some initial speed, the value of $\eta$ will change. Choose the correct answer from the options given below:

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

Correct answer: C

For a particular ideal gas which of the following graphs represents the variation of mean squared velocity of the gas molecules with temperature?

1. A.Concave-down increasing curve
2. B.Curve rising to a peak then falling
3. C.Concave-up increasing curve
4. D.Straight line through the origin✓

Correct answer: D

A hemispherical vessel is completely filled with a liquid of refractive index $\mu$. A small coin is kept at the lowest point (O) of the vessel as shown in figure. The minimum value of the refractive index of the liquid so that a person can see the coin from point E (at the level of the vessel) is ______.

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

Correct answer: A

Find the equivalent resistance between two ends of the following circuit

1. A.$\frac{r}{3}$
2. B.r
3. C.$\frac{r}{9}$✓
4. D.$\frac{r}{6}$

Correct answer: C

The center of mass of a thin rectangular plate (fig - x) with sides of length a and b, whose mass per unit area ($\sigma$) varies as $\sigma=\frac{\sigma_0x}{ab}$ (where $\sigma_0$ is a constant), would be ______

1. A.$\left(\frac{1}{3}a, \frac{b}{2}\right)$
2. B.$\left(\frac{2}{3}a, \frac{2}{3}b\right)$
3. C.$\left(\frac{a}{2}, \frac{b}{2}\right)$
4. D.$\left(\frac{2}{3}a, \frac{b}{2}\right)$✓

Correct answer: D

Choose the correct nuclear process from the below options [p: proton, n: neutron, $e^-$: electron, $e^+$: positron, $\nu$ : neutrino, $\bar{\nu}$ : antineutrino]

1. A.$n\to p+e^++\bar{\nu}$
2. B.$n\to p+e^++\nu$
3. C.$n\to p+e^-+\bar{\nu}$✓
4. D.$n\to p+e^-+\nu$

Correct answer: C

Three infinitely long wires with linear charge density $\lambda$ are placed along the x–axis, y–axis and z–axis respectively. Which of the following denotes an equipotential surface?

1. A.(x + y) (y + z) (z + x) = constant
2. B.xyz = constant
3. C.xy + yz + zx = constant
4. D.$(x^2+y^2)(y^2+z^2)(z^2+x^2)$ = constant✓

Correct answer: D

A wire of resistance R is bent into an equilateral triangle and an identical wire is bent into a square. The ratio of resistance between the two end points of an edge of the triangle to that of the square is

1. A.32/27✓
2. B.27/32
3. C.9/8
4. D.8/9

Correct answer: A

Consider a long thin conducting wire carrying a uniform current I. A particle having mass "M" and charge "q" is released at a distance "a" from the wire with a speed $v_0$ along the direction of current in the wire. The particle gets attracted to the wire due to magnetic force. The particle turns round when it is at distance x from the wire. The value of x is [$\mu_0$ is vacuum permeability]

1. A.$a\left[1-\frac{mv_0}{2q\mu_0I}\right]$
2. B.$\frac{a}{2}$
3. C.$ae^{-\frac{4\pi mv_0}{q\mu_0I}}$✓
4. D.$a\left[1-\frac{mv_0}{q\mu_0I}\right]$

Correct answer: C

Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R. Assertion A: A sound wave has higher speed in solids than gases. Reason R: Gases have higher value of Bulk modulus than solids. In the light of the above statements, choose the correct answer from the options given below

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

Correct answer: C

Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R. Assertion A: In a central force field, the work done is independent of the path chosen. Reason R: Every force encountered in mechanics does not have an associated potential energy. In the light of the above statements, choose the most appropriate answer from the options given below

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

Correct answer: C

A bead of mass 'm' slides without friction on the wall of a vertical circular hoop of radius 'R' as shown in figure. The bead moves under the combined action of gravity and a massless spring (k) attached to the bottom of the hoop. The equilibrium length of the spring is 'R'. If the bead is released from top of the hoop with (negligible) zero initial speed, velocity of bead, when the length of spring becomes 'R', would be (spring constant is 'k', g is accleration due to gravity)

1. A.$2\sqrt{gR+\frac{kR^2}{m}}$
2. B.$\sqrt{2Rg+\frac{4kR^2}{m}}$
3. C.$\sqrt{2Rg+\frac{kR^2}{m}}$
4. D.$\sqrt{3Rg+\frac{kR^2}{m}}$✓

Correct answer: D

Which of the following circuits has the same outpur as that of the given circuit? [A and NOT(B) feed an AND gate; A and B feed a second AND gate; the two AND outputs feed a NOR gate giving Y]

1. A.B alone into a NOT (drawn as AND-with-bubble with one input) giving Y
2. B.A and B into an AND gate giving Y
3. C.A and B into an AND gate followed by a NOT giving Y
4. D.A alone into a NOT gate giving Y✓

Correct answer: D

A particle of mass 'm' and charge 'q' is fastened to one end 'A' of a massless string having equilibrium length $l$, whose other end is fixed at point 'O'. The whole system is placed on a frictionless horizontal plane and is initially at rest. If uniform electric field is switched on along the direction as shown in figure, then the speed of the particle when it crosses the x–axis is

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

Correct answer: A

A proton of mass '$m_p$' has same energy as that of a photon of wavelength '$\lambda$'. If the proton is moving at non-relativistic speed, then ratio of its de Broglie wavelength to the wavelength of photon is.

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

Correct answer: A

A thin prism $P_1$ with angle 4° made of glass having refractive index 1.54, is combined with another thin prism $P_2$ made of glass having refractive index 1.72 to get dispersion without deviation. The angle of the prism $P_2$ in degrees is

1. A.16/3
2. B.1.5
3. C.3✓
4. D.4

Correct answer: C

A Carnot engine (E) is working between two temperatures 473K and 273K. In a new system two engines - engine $E_1$ works between 473K to 373K and engine $E_2$ works between 373K to 273K. If $\eta_{12}$, $\eta_1$ and $\eta_2$ are the efficiencies of the engines E, $E_1$ and $E_2$, respectively, then

1. A.$\eta_{12}\ge\eta_1+\eta_2$
2. B.$\eta_{12}=\eta_1+\eta_2$
3. C.$\eta_{12}=\eta_1\eta_2$
4. D.$\eta_{12}<\eta_1+\eta_2$✓

Correct answer: D

Two capacitors $C_1$ and $C_2$ are connected in parallel to a battery. Charge-time graph is shown below for the two capacitors. The energy stored with them are $U_1$ and $U_2$, respectively. Which of the given statements is true?

1. A.$C_2>C_1$, $U_2<U_1$
2. B.$C_1>C_2$, $U_1<U_2$
3. C.$C_2>C_1$, $U_2>U_1$✓
4. D.$C_1>C_2$, $U_1>U_2$

Correct answer: C

Consider following statements: A. Surface tension arises due to extra energy of the molecules at the interior as compared to the molecules at the surface, of a liquid. B. As the temperature of liquid rises, the coefficient of viscosity increases. C. As the temperature of gas increases, the coefficient of viscosity increases D. The onset of turbulence is determined by Reynold's number. E. In a steady flow two stream lines never intersect. Choose the correct answer from the options given below:

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

Correct answer: B

In a measurement, it is asked to find modulus of elasticity per unit torque applied on the system. The measured quantity has dimension of $[M^aL^bT^c]$. If b = 3, the value of c is ______

Correct answer: 0

A double slit interference experiment performed with a light of wavelength 600 nm forms an interference fringe pattern on a screen with 10th bright fringe having its centre at a distance of 10 mm from the central maximum. Distance of the centre of the same 10th bright fringe from the central maximum when the source of light is replaced by another source of wavelength 660 nm would be ______ mm.

Correct answer: 11

A tiny metallic rectangular sheet has length and breadth of 5 mm and 2.5 mm, respectively. Using a specially designed screw gauge which has pitch of 0.75 mm and 15 divisions in the circular scale, you are asked to find the area of the sheet. In this measurement, the maximum fractional error will be $\frac{x}{100}$ where x is ______.

Correct answer: 3

Two iron solid discs of negligible thickness have radii $R_1$ and $R_2$ and moment of intertia $I_1$ and $I_2$, respectively. For $R_2=2R_1$, the ratio of $I_1$ and $I_2$ would be 1/x, where x = ______.

Correct answer: 16

The moment of inertia of a solid disc rotating along its diameter is 2.5 times higher than the moment of inertia of a ring rotating in similar way. The moment of inertia of a solid sphere which has same radius as the disc and rotating in similar way, is n times higher than the moment of inertia of the given ring. Here, n = ______. Consider all the bodies have equal masses.

Correct answer: 4

Given below are two statements: Statement I: In the oxalic acid vs $KMnO_4$ (in the presence of dil $H_2SO_4$) titration the solution needs to be heated initially to 60°C, but no heating is required in Ferrous ammonium sulphate (FAS) vs $KMnO_4$ titration (in the presence of dil $H_2SO_4$) Statement II: In oxalic acid vs $KMnO_4$ titration, the initial formation of $MnSO_4$ takes place at high temperature, which then acts as catalyst for further reaction. In the case of FAS vs $KMnO_4$, heating oxidizes $Fe^{2+}$ into $Fe^{3+}$ by oxygen of air and error may be introduced in the experiment. 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 is true

Correct answer: A

Both acetaldehyde and acetone (individually) undergo which of the following reactions? A. Iodoform Reaction B. Cannizaro Reaction C. Aldol Condensation D. Tollen's Test E. Clemmensen Reduction. Choose the correct answer from the options given below:

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

Correct answer: B

Given below are two statements: Statement I : D-glucose pentaacetate reacts with 2, 4 – dinitrophenylhydrazine Statement II : Starch, on heating with concentrated sulfuric acid at 100°C and 2 - 3 atmosphere pressure produces glucose. 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: C

The metal ion whose electronic configuration is not affected by the nature of the ligand and which gives a violet colour in non-luminous flame under hot condition in borax bead test is

1. A.$Ni^{2+}$✓
2. B.$Mn^{2+}$
3. C.$Cr^{3+}$
4. D.$Ti^{3+}$

Correct answer: A

Consider the following elements In, Tl, Al, Pb, Sn and Ge. The most stable oxidation states of elements with highest and lowest first ionisation enthalpies, respectively, are

1. A.+2 and +3
2. B.+4 and +1
3. C.+1 and +4
4. D.+4 and +3✓

Correct answer: D

In a multielectron atom, which of the following orbitals described by three quantum numbers will have same energy in absence of electric and magnetic fields? A. n = 1, l = 0, $m_l$ = 0 B. n = 2, l = 0, $m_l$ = 0 C. n = 2, l = 1, $m_l$ = 1 D. n = 3, l = 2, $m_l$ = 1 E. n = 3, l = 2, $m_l$ = 0. Choose the correct answer from the options given below:

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

Correct answer: C

A weak acid HA has degree of dissociation x. Which option gives the correct expression of (pH − p$K_a$)?

1. A.log (1 + 2x)
2. B.$\log\left(\frac{1-x}{x}\right)$
3. C.$\log\left(\frac{x}{1-x}\right)$✓
4. D.0

Correct answer: C

The products A and B in the following reactions, respectively are: A $\xleftarrow{Ag-NO_2}$ $CH_3-CH_2-CH_2-Br$ $\xrightarrow{AgCN}$ B

1. A.$CH_3-CH_2-CH_2-NO_2$, $CH_3-CH_2-CH_2-NC$✓
2. B.$CH_3-CH_2-CH_2-NO_2$, $CH_3-CH_2-CH_2-CN$
3. C.$CH_3-CH_2-CH_2-ONO$, $CH_3-CH_2-CH_2-CN$
4. D.$CH_3-CH_2-CH_2-ONO$, $CH_3-CH_2-CH_2-NC$

Correct answer: A

Which of the following oxidation reactions are carried out by both $K_2Cr_2O_7$ and $KMnO_4$ in acidic medium? A. $I^-\to I_2$ B. $S^{2-}\to S$ C. $Fe^{2+}\to Fe^{3+}$ D. $I^-\to IO_3^-$ E. $S_2O_3^{2-}\to SO_4^{2-}$. Choose the correct answer from the options given below:

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

Correct answer: A

The compounds that produce $CO_2$ with aqueous $NaHCO_3$ solution are: A. benzoic acid B. phenol C. 2,4,6-trinitrophenol (picric acid) D. cyclohexanecarboxylic acid E. 3-methoxyphenol. Choose the correct answer from the options given below:

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

Correct answer: D

Consider 'n' is the number of lone pair of electrons present in the equatorial position of the most stable structure of $ClF_3$. The ions from the following with 'n' number of unpaired electrons are A. $V^{3+}$ B. $Ti^{3+}$ C. $Cu^{2+}$ D. $Ni^{2+}$ E. $Ti^{2+}$. Choose the correct answer from the options given below:

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

Correct answer: D

The molecules having square pyramidal geometry are

1. A.$SbF_5$ & $PCl_5$
2. B.$SbF_5$ & $XeOF_4$
3. C.$BrF_5$ & $PCl_5$
4. D.$BrF_5$ & $XeOF_4$✓

Correct answer: D

Match the LIST-I with LIST-II. LIST-I (Redox Reaction): A. $CH_4(g)+2O_2(g)\xrightarrow{\Delta}CO_2(g)+2H_2O(l)$ B. $2NaH(s)\xrightarrow{\Delta}2Na(s)+H_2(g)$ C. $V_2O_5(s)+5Ca(s)\xrightarrow{\Delta}2V(s)+5CaO(s)$ D. $2H_2O_2(aq)\xrightarrow{\Delta}2H_2O(l)+O_2(g)$. LIST-II (Type of Redox Reaction): I. Disproportionation reaction II. Combination reaction III. Decomposition reaction IV. Displacement reaction. Choose the correct answer from the options given below:

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

Correct answer: C

Given below are two statements: Statement I: $Et_2N-CH_2CH_2-Cl$ will undergo alkaline hydrolysis at a faster rate than $Et_2CH-CH_2CH_2-Cl$. Statement II: In $Et_2N-CH_2CH_2-Cl$, intramolecular substitution takes place first by involving lone pair of electrons on nitrogen. In the light of the above statements, choose the most appropriate answer from the options given below

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

Correct answer: B

Ice and water are placed in a closed container at a pressure of 1 atm and temperature 273.15K. If pressure of the system is increased 2 times, keeping temperature constant, then identify correct observation from following

1. A.The amount of ice decreases.
2. B.The solid phase (ice) disappears completely.✓
3. C.Volume of system increases .
4. D.Liquid phase disappears completely.

Correct answer: B

For a given reaction R → P, $t_{1/2}$ is related to $[A]_0$ as given in table: $[A]_0$ = 0.100 mol $L^{-1}$, $t_{1/2}$ = 200 min; $[A]_0$ = 0.025 mol $L^{-1}$, $t_{1/2}$ = 100 min. Given: log 2 = 0.30. Which of the following is true? A. The order of the reaction is 1/2. B. If $[A]_0$ is 1M, then $t_{1/2}$ is $200\sqrt{10}$ min C. The order of the reaction changes to 1 if the concentration of reactant changes from 0.100 M to 0.500 M. D. $t_{1/2}$ is 800 min for $[A]_0$ = 1.6 M. Choose the correct answer from the options given below:

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

Correct answer: B

What is the freezing point depression constant of a solvent, 50 g of which contain 1 g non volatile solute (molar mass 256 g $mol^{-1}$) and the decrease in freezing point is 0.40 K ?

1. A.5.12 K kg $mol^{-1}$✓
2. B.3.72 K kg $mol^{-1}$
3. C.1.86 K kg $mol^{-1}$
4. D.4.43 K kg $mol^{-1}$

Correct answer: A

The correct order of stability of following carbocations is : A: triphenylmethyl cation $Ph_3C^+$; B: diphenylmethyl cation $Ph_2CH^+$; C: cycloheptatrienyl (tropylium) cation; D: sec-butyl cation $CH_3CH_2\overset{+}{C}HCH_3$.

1. A.C > B > A > D
2. B.A > B > C > D
3. C.C > A > B > D✓
4. D.B > C > A > D

Correct answer: C

The incorrect decreasing order of atomic radii is

1. A.Mg > Al > C > O
2. B.Si > P > Cl > F
3. C.Al > B > N > F
4. D.Be > Mg > Al > Si✓

Correct answer: D

Given below is the plot of the molar conductivity vs $\sqrt{\text{concentration}}$ for KCl in aqueous solution. If, for the higher concentration of KCl solution, the resistance of the conductivity cell is 100 $\Omega$, then the resistance of the same cell with the dilute solution is \'x\' $\Omega$. The value of x is ______ (Nearest integer)

Correct answer: 150