JEE Main 24 February 2021 Shift 1 Question Paper

Question 1

The locus of the mid-point of the line segment joining the focus of the parabola $y^2=4ax$ to a moving point of the parabola, is another parabola whose directrix is:.

Accepted Answer

(B) $x = 0$

Answer

(A) $x = a$

Answer

(C) $x = -\frac{a}{2}$

Answer

(D) $x = \frac{a}{2}$

Question 2

A scientific committee is to formed from 6 Indians and 8 foreigners, which includes at least 2 Indians and double the number of foreigners as Indians. Then the number of ways, the committee can be formed is:

Accepted Answer

(C) 1625

Answer

(A) 560

Answer

(B) 1050

Answer

(D) 575

Question 3

The equation of the plane passing through the point $(1, 2, -3)$ and perpendicular to the planes $3x + y - 2z = 5$ and $2x - 5y - z = 7$, is:

Accepted Answer

(C) $11x + y + 17z + 38 = 0$

Answer

(A) $3x - 10y - 2z + 11 = 0$

Answer

(B) $6x - 5y - 2z - 2 = 0$

Answer

(D) $6x - 5y + 2z + 10 = 0$

Question 4

A man is walking on a straight line. The arithmetic mean of the reciprocals of the intercepts of this line on the coordinate axes is $\frac{1}{4}$. Three stones A, B and C are placed at the points $(1, 1)$, $(2, 2)$ and $(4, 4)$ respectively. Then which of these stones is/are on the path of the man?

Accepted Answer

(A) B only

Answer

(B) A only

Answer

(C) All the three

Answer

(D) C only

Question 5

The statement among the following that is a tautology is:

Accepted Answer

(D) $\left[A \wedge (A \rightarrow B)\right] \rightarrow B$

Answer

(A) $A \wedge (A \vee B)$

Answer

(B) $B \rightarrow \left[A \wedge (A \rightarrow B)\right]$

Answer

(C) $A \vee (A \wedge B)$

Question 6

Let $f : R \rightarrow R$ be defined as $f(x) = 2x-1$ and $g : R - \{1\} \rightarrow R$ be defined as $g(x) = \frac{x - \frac{1}{2}}{x - 1}$. Then the composition function $f(g(x))$ is :

Accepted Answer

(D) one-one but not onto

Answer

(A) both one-one and onto

Answer

(B) onto but not one-one

Answer

(C) neither one-one nor onto

Question 7

If $f : R \rightarrow R$ is a function defined by $f(x) = [x-1] \cos\left(\frac{2x - 1}{2}\right)\pi$, where $[.]$ denotes the greatest integer function, then $f$ is :

Accepted Answer

(D) continuous for every real $x$

Answer

(A) discontinuous only at $x = 1$

Answer

(B) discontinuous at all integral values of $x$ except at $x = 1$

Answer

(C) continuous only at $x = 1$

Question 8

The function $f(x) = \frac{4x^3 - 3x^2}{6} - 2\sin x + (2x - 1)\cos x$ :

Accepted Answer

(A) increases in $\left[\frac{1}{2}, \infty\right)$

Answer

(B) decreases $\left(-\infty, \frac{1}{2}\right]$

Answer

(C) increases in $\left(-\infty, \frac{1}{2}\right]$

Answer

(D) decreases $\left[\frac{1}{2}, \infty\right)$

Question 9

The distance of the point $(1, 1, 9)$ from the point of intersection of the line $\frac{x - 3}{1} = \frac{y - 4}{2} = \frac{z - 5}{2}$ and the plane $x + y + z = 17$ is:

Accepted Answer

(A) $\sqrt{38}$

Answer

(B) $19\sqrt{2}$

Answer

(C) $2\sqrt{19}$

Answer

(D) $38$

Question 10

Two vertical poles are 150 m apart and the height of one is three times that of the other. If from the middle point of the line joining their feet, an observer finds the angles of elevation of their tops to  be complementary, then the height of the shorter pole (in meters) is:

Accepted Answer

(D) $25\sqrt{3}$

Answer

(A) 25

Answer

(B) $20\sqrt{3}$

Answer

(C) 30

Question 11

If the tangent to the curve $y = x^3$ at the point $P(t, t^3)$ meets the curve again at $Q$, then the ordinate of the point which divides $PQ$ internally in the ratio $1 : 2$ is :

Accepted Answer

(A) $-2t^3$

Answer

(B) $-t^3$

Answer

(C) $0$

Answer

(D) $2t^3$

Question 12

The area (in sq. units) of the part of the circle $x^2+y^2=36$, which is outside the parabola $y^2=9x$, is :

Accepted Answer

(D) $24\pi - 3\sqrt{3}$

Answer

(A) $24\pi + 3\sqrt{3}$

Answer

(B) $12\pi + 3\sqrt{3}$

Answer

(C) $12\pi - 3\sqrt{3}$

Question 13

If $\int \frac{\cos x - \sin x}{\sqrt{8 - \sin 2x}} dx = a \sin^{-1}\left(\frac{\sin x + \cos x}{b}\right) + c$, where $c$ is a constant of integration, then the ordered pair $(a, b)$ is equal to :

Accepted Answer

(B) $(1, 3)$

Answer

(A) $(1, -3)$

Answer

(C) $(-1, 3)$

Answer

(D) $(3, 1)$

Question 14

The population $P = P(t)$ at time 't' of a certain species follows the differential equation $\frac{dP}{dt} = 0.5P - 450$. If $P(0) = 850$, then the time at which population becomes zero is :

Accepted Answer

(B) $2\log_e 18$

Answer

(A) $\frac{1}{2}\log_e 18$

Answer

(C) $\log_e 9$

Answer

(D) $\log_e 18$

Question 15

The value of
$-{}^{15}C_1 + 2.{}^{15}C_2 - 3.{}^{15}C_3 + .... -15.{}^{15}C_{15} + {}^{14}C_1 + {}^{14}C_3 + {}^{14}C_5 + ....+ {}^{14}C_{11}$ is:

Accepted Answer

(D) $2^{13} - 14$

Answer

(A) $2^{14}$

Answer

(B) $2^{13} - 13$

Answer

(C) $2^{16} - 1$

Question 16

An ordinary dice is rolled for a certain number of times. If the probability of getting an odd number 2 times is equal to the probability of getting an even number 3 times, then the probability of getting an odd number for odd number of times is :

Accepted Answer

(B) $\frac{1}{2}$

Answer

(A) $\frac{3}{16}$

Answer

(C) $\frac{5}{16}$

Answer

(D) $\frac{1}{32}$

Question 17

Let p and q be two positive number such that $p + q = 2$ and $p^4 + q^4 = 272$. Then p and q are roots of the equation :

Accepted Answer

(D) $x^2 - 2x + 16 = 0$

Answer

(A) $x^2 - 2x + 2 = 0$

Answer

(B) $x^2 - 2x + 8 = 0$

Answer

(C) $x^2 - 2x + 136 = 0$

Question 18

If $e^{\left(\cos^2 x + \cos^4 x + \cos^6 x + ...\infty\right)\log_e 2}$ satisfies the equation $t^2 - 9t + 8 = 0$, then the value of $\frac{2\sin x}{\sin x + \sqrt{3}\cos x}\left(0 < x < \frac{\pi}{2}\right)$ is :

Accepted Answer

(C) $\frac{1}{2}$

Answer

(A) $\frac{3}{2}$

Answer

(B) $2\sqrt{3}$

Answer

(D) $\sqrt{3}$

Question 19

The system of linear equations
$3x - 2y - kz = 10$
$2x - 4y - 2z = 6$
$x + 2y - z = 5m$
is inconsistent if :

Accepted Answer

(D) $k = 3, m 
eq \frac{4}{5}$

Answer

(A) $k = 3, m = \frac{4}{5}$

Answer

(B) $k 
eq 3, m \in R$

Answer

(C) $k 
eq 3, m 
eq \frac{4}{5}$

Question 20

Let $P = \begin{bmatrix} 3 & -1 & -2 \ 2 & 0 & \alpha \ 3 & -5 & 0 \end{bmatrix}$, where $\alpha \in R$. Suppose $Q = [q_{ij}]$ is a matrix satisfying $PQ = kI_3$ for some non-zero $k \in R$. If $q_{23} = -\frac{k}{8}$ and $|Q| = \frac{k^2}{2}$, then $\alpha^2 + k^2$ is equal to _______

Accepted Answer

17

Question 21

Let $B_i(i = 1, 2, 3)$ be three independent events in a sample space. The probability that only $B_1$ occur is $\alpha$, only $B_2$ occurs is $\beta$ and only $B_3$ occurs is $\gamma$. Let p be the probability that none of the events $B_i$ occurs and these 4 probabilities satisfy the equations $(\alpha - 2\beta)p = \alpha\beta$ and $(\beta - 3\gamma)p = 2\beta\gamma$ (All the probabilities are assumed to lie in the interval (0, 1)). Then $\frac{P(B_1)}{P(B_3)}$ is equal to _____

Accepted Answer

6

Question 22

The minimum value of $\alpha$ for which the equation $\frac{4}{\sin x} + \frac{1}{1 - \sin x} = \alpha$ has at least one solution in $\left(0, \frac{\pi}{2}\right)$ is ______

Accepted Answer

9

Question 23

If one of the diameters of the circle $x^2 + y^2 - 2x - 6y + 6 = 0$ is a chord of another circle ‘C’ whose center is at (2,1), then its radius is _______

Accepted Answer

3

Question 24

$\lim_{x 	o \infty} 	an\left\{ \sum_{r=1}^{n} 	an^{-1}\left(\frac{1}{1 + r + r^2}ight) ight\}$ is equal to ______

Accepted Answer

1

Question 25

If $\int_{-a}^{a} \left(|x| + |x - 2|\right) dx = 22$ ,$(a > 2)$ and [x] denotes the greatest integer $\leq x$, then $\int_{a}^{-a} \left(x + [x]\right) dx$ is equal to ______

Accepted Answer

3

Question 26

Let three vectors $\vec{a}, \vec{b}$ and $\vec{c}$ be such that $\vec{c}$ is coplanar with $\vec{a}$ and $\vec{b}$, $\vec{a} \cdot \vec{c} = 7$ and $\vec{b}$ is perpendicular to $\vec{c}$, where $\vec{a} = -\hat{i} + \hat{j} + \hat{k}$ and $\vec{b} = 2\hat{i} + \hat{k}$, then the value of $2\left|\vec{a} + \vec{b} + \vec{c}\right|^2$ is ________

Accepted Answer

75

Question 27

Let $A = \{n \in N : n 	ext{ is a 3-digit number}\}$
$B = \{9k + 2 : k \in N\}$
and $C : \{9k + \ell : k \in N\}$ for some $\ell$ $(0 < \ell < 9)$
If the sum of all the elements of the set $A \cap (B \cup C)$ is $274 	imes 400$, then $\ell$ is equal to __

Accepted Answer

5

Question 28

If the least and the largest real values of $\alpha$, for which the equation $z + \alpha|z - 1| + 2i = 0$ $\left(z \in C 	ext{ and } i = \sqrt{-1}ight)$ has a solution, are p and q respectively; then $4(p^2 + q^2)$ is equal to ____

Accepted Answer

10

Question 29

Let M be any $3 	imes 3$ matrix with entries from the set $\{0, 1, 2\}$. The maximum number of such matrices, for which the sum of diagonal elements of $M^T M$ is seven, is __

Accepted Answer

540

Question 30

Four identical particles of equal masses 1 kg made to move along the circumference of a circle of radius 1 m under the action of their own mutual gravitational attraction. The speed of each particle will be -

Accepted Answer

(A) $\frac{\sqrt{(1+2\sqrt{2})G}}{2}$

Answer

(B) $\sqrt{G(1+2\sqrt{2})}$

Answer

(C) $\sqrt{\frac{G}{2}\left(2\sqrt{2}-1\right)}$

Answer

(D) $\sqrt{\frac{G}{2}\left(1+2\sqrt{2}\right)}$

Question 31

Consider two satellites $S_1$ and $S_2$ with periods of revolution 1 hr. and 8 hr. respectively revolving around a planet in circular orbits.The ratio of angular velocity of satellite $S_1$ to the angular velocity of satellite $S_2$ is -

Accepted Answer

(A) 8 : 1

Answer

(B) 1 : 8

Answer

(C) 2 : 1

Answer

(D) 1 : 4

Question 32

n mole of a perfect gas undergoes a cyclic process ABCA (see figure) consisting of the following processes –
A$\rightarrow$B : Isothermal expansion at temperature T so that the volume is doubled from $V_1$ to $V_2 = 2V_1$ and pressure changes from $P_1$ to $P_2$.
B $\rightarrow$ C : Isobaric compression at pressure $P_2$ to initial volume $V_1$.
C $\rightarrow$ A : Isochoric change leading to change of pressure from $P_2$ to $P_1$.
Total workdone in the complete cycle ABCA is –

Accepted Answer

(D) $nRT\left(\ln 2 - \frac{1}{2}\right)$

Answer

(A) 0

Answer

(B) $nRT\left(\ln 2 + \frac{1}{2}\right)$

Answer

(C) $nRT\ln 2$

Question 33

Two equal capacitors are first connected in series and then in parallel. The ratio of the equivalent capacities capacities in the two cases will be -

Accepted Answer

(B) 1 : 4

Answer

(A) 2 : 1

Answer

(C) 4 : 1

Answer

(D) 1 : 2

Question 34

A cell $E_1$ of emf 6V and internal resistance 2$\Omega$ is connected with another cell $E_2$ of emf 4V and internal resistance 8$\Omega$ (as shown in the figure). The potential difference across points X and Y is –

Accepted Answer

(C) 5.6V

Answer

(A) 3.6V

Answer

(B) 10.0V

Answer

(D) 2.0V

Question 35

If Y,K and $\eta$ are the values of Young's modulus, bulk modulus and modulus of rigidity of any material respectively. Choose the correct relation for these parameters.

Accepted Answer

(A) $K = \frac{Y\eta}{9\eta - 3Y}$ N/m$^2$

Answer

(B) $\eta = \frac{3YK}{9K + Y}$ N/m$^2$

Answer

(C) $Y = \frac{9K\eta}{3K - \eta}$ N/m$^2$

Answer

(D) $Y = \frac{9K\eta}{2\eta + 3K}$ N/m$^2$

Question 36

Two stars of masses m and 2m at a distance d rotate about their common centre of mass in free space. The period of revolution is -

Accepted Answer

(A) $2\pi\sqrt{\frac{d^3}{3Gm}}$

Answer

(B) $\frac{1}{2\pi}\sqrt{\frac{3Gm}{d^3}}$

Answer

(C) $\frac{1}{2\pi}\sqrt{\frac{d^3}{3Gm}}$

Answer

(D) $2\pi\sqrt{\frac{3Gm}{d^3}}$

Question 37

If the velocity-time graph has the shape AMB, what would be the shape of the corresponding acceleration-time graph ?

Accepted Answer

(A) (A)

Answer

(B) (B)

Answer

(C) (C)

Answer

(D) (D)

Question 38

Given below are two statements :
Statement – I: Two photons having equal linear momenta have equal wavelengths.
Statement-II: If the wavelength of photon is decreased, then the momentum and energy of a photon will also decrease.
In the light of the above statements, choose the correct answer from the options given below.

Accepted Answer

(D) Statement-I is true but Statement-II is false

Answer

(A) Statemnet-I is false but Statement-II is true

Answer

(B) Both Statement-I and Statement-II are true

Answer

(C) Both Statement-I and Statement-II are false

Question 39

A current through a wire depends on time as $i = \alpha_0 t + \beta t^2$
where $\alpha_0$ = 20 A/s and $\beta$ = 8 As$^{-2}$. Find the charge crossed through a section of the wire in 15 s.

Accepted Answer

(D) 11250 C

Answer

(A) 2100 C

Answer

(B) 260 C

Answer

(C) 2250 C

Question 40

match List I with List II
List-I
(a) Isothermal
(b) Isochoric
(c) Adiabatic
(d) Isobaric
List-II
(i) Pressure constant
(ii) Temperature constant
(iii) Volume constant
(iv) Heat content is constant
Choose the correct answer from the options given below –

Accepted Answer

(B) (a) – (ii), (b) – (iii), (c) – (iv), (d) – (i)

Answer

(A) (a) – (ii), (b) – (iv), (c) – (iii), (d) – (i)

Answer

(C) (a) – (i), (b) – (iii), (c) – (ii), (d) – (iv)

Answer

(D) (a) – (iii), (b) – (ii), (c) – (i), (d) – (iv)

Question 41

In the given figure, the energy levels of hydrogen atom have been shown along with some transitions marked A,B,C,D and E.
The transitions A,B and C respectively represents –

Accepted Answer

(A) The series limit of Lyman series, third member of balmer series and second member of paschen series

Answer

(B) The first member of the Lyman series, third member of Balmer series and second member of paschen series

Answer

(C) The ionization potential of hydrogen, second member of Balmer series and third member of Paschen series

Answer

(D) The series limit of Lyman series, second memebr of Balmer series and second member of Paschen series.

Question 42

The focal length f is related to the radius of curvature r of the spherical convex mirror by -

Accepted Answer

(C) $f = +\frac{1}{2}r$

Answer

(A) $f = r$

Answer

(B) $f = -\frac{1}{2}r$

Answer

(D) $f = -r$

Question 43

Moment of inertia (M.I.) of four bodies, having same mass and radius, are reported as –
$I_1$ = M.I. of thin circular ring about its diameter,
$I_2$ = M.I. of circular disc about an axis perpendicular to disc and going through the centre,
$I_3$ = M.I. of solid cylinder about its axis and
$I_4$ = M.I. of solid sphere about its diameter.
Then :-

Accepted Answer

(D) $I_1 = I_2 = I_3 > I_4$

Answer

(A) $I_1 = I_2 = I_3 < I_4$

Answer

(B) $I_1 + I_2 = I_3 + \frac{5}{2}I_4$

Answer

(C) $I_1 + I_3 < I_2 + I_4$

Question 44

The workdone by a gas molecule in an isolated system is given by, $W = \alpha\beta^2 e^{-\frac{x^2}{\alpha kT}}$ , where x is the displacement, k is the Boltzmann constant and T is the temperature.$\alpha$ and $\beta$ are constants. Then the dimensions of $\beta$ will be -

Accepted Answer

(C) $[MLT^{-2}]$

Answer

(A) $[M^0LT^0]$

Answer

(B) $[M^2LT^2]$

Answer

(D) $[ML^2T^{-2}]$

Question 45

If an emitter current is changed by 4mA, the collector current changes by 3.5 mA.The value of $\beta$ will be -

Accepted Answer

(A) 7

Answer

(B) 0.875

Answer

(C) 0.5

Answer

(D) 3.5

Question 46

In a Young's double slit experiment, the width ofthe one of the slit is three times the other slit. The amplitude of the light coming from a slit is proportional to the slit-width. Find the ratio of the maximum to the minimum intensity in the interference pattern.

Accepted Answer

(A) 4 : 1

Answer

(B) 2 : 1

Answer

(C) 3 : 1

Answer

(D) 1 : 4

Question 47

In the given figure, a mass M is attached to a horizontal spring which is fixed on one side to a rigid support. The spring constant of the spring is k. The mass oscillates on a frictionless surface with time period T and amplitude A. When the mass is in equilibrium position, as shown in the figure, another mass m is gently fixed upon it. The new amplitude of oscillation will be -

Accepted Answer

(A) $A\sqrt{\frac{M}{M+m}}$

Answer

(B) $A\sqrt{\frac{M}{M-m}}$

Answer

(C) $A\sqrt{\frac{M-m}{M}}$

Answer

(D) $A\sqrt{\frac{M+m}{M}}$

Question 48

A cube of side 'a' has point charges +Q located at each of its vertices except at the origin where the charge is –Q. The electric field at the centre of cube is :

Accepted Answer

(C) $\frac{-2Q}{3\sqrt{3}\pi\varepsilon_0 a^2}\left(\hat{x}+\hat{y}+\hat{z}\right)$

Answer

(A) $\frac{2Q}{3\sqrt{3}\pi\varepsilon_0 a^2}\left(\hat{x}+\hat{y}+\hat{z}\right)$

Answer

(B) $\frac{Q}{3\sqrt{3}\pi\varepsilon_0 a^2}\left(\hat{x}+\hat{y}+\hat{z}\right)$

Answer

(D) $\frac{-Q}{3\sqrt{3}\pi\varepsilon_0 a^2}\left(\hat{x}+\hat{y}+\hat{z}\right)$

Question 49

Each side of a box made of metal sheet in cubic shape is 'a' at room temperature 'T', the coefficient of linear expansion of the metal sheet is '$\alpha$'. The metal sheet is heated uniformly, by a small temperature $\Delta$T, so that its new temeprature is T+$\Delta$T. Calculate theincrease in the volume of the metal box-

Accepted Answer

(C) $3a^3\alpha\Delta T$

Answer

(A) $\frac{4}{3}\pi a^3\alpha\Delta T$

Answer

(B) $4\pi a^3\alpha\Delta T$

Answer

(D) $4a^3\alpha\Delta T$

Question 50

A resonance circuit having inductance and resistance $2 	imes 10^{-4}$ H and 6.28 $\Omega$ respectively oscillates at 10 MHz frequency. The value of quality factor of this resonator is__________.
[$\pi$ = 3.14]

Accepted Answer

2000

Question 51

A ball with a speed of 9 m/s collides with another identical ball at rest. After thecollision, the direction of each ball makes an angle of 30° with the original direction. The ratio of velocities of the balls after collision is x : y, where x is ___________.

Accepted Answer

1

Question 52

An audio signal $\upsilon_m$ = 20sin2$\pi$(1500t) amplitude modulates a carrier $\upsilon_c$ =80 sin 2$\pi$ (100,000t). The value of percent modulation is __________.

Accepted Answer

25

Question 53

The coefficient of static friction between a wooden block of mass 0.5 kg and a vertical rough wall is 0.2. The magnitude of horizontal force that should be applied on the block to keep it adhere to the wall will be ________ N.
[g = 10 ms$^{-2}$]

Accepted Answer

25

Question 54

An inclined plane is bent in such a way that the vertical cross-section is given by $y = \frac{x^2}{4}$ where y is in vertical and x in horizontal direction. If the upper surface of this curved plane is rough with coefficient of friction $\mu$ = 0.5, the maximum height in cm at which a stationary block will not slip downward is ______ cm.

Accepted Answer

25

Question 55

An electromagnetic wave of frequency 5 GHz, is travelling in a medium whose relative electric permittivity and relative magnetic permeability bothare 2. Its velocity in this medium is ________ $	imes 10^{7}$ m/s.

Accepted Answer

15

Question 56

A hydraulic press can lift 100 kg when a mass ‘m’ is placed on the smaller piston. It can lift ________ kg when the diameter of the larger piston is increased by 4 times and that of the smaller piston is decreased by 4 times keeping the same mass ‘m’ on the smaller piston.

Accepted Answer

25600

Question 57

A common transistor radio set requires 12 V (D.C.) for its operation. The D.C. source is constructed by using a transformer and a rectifier circuit, which are operated at 220 V (A.C.) on standard domestic A.C. supply. The number of turns of secondary coil are 24, then the number of turns of primary are ________.

Accepted Answer

440

Question 58

An unpolarized light beam is incident on the polarizer of a polarization experiment and the intensity of light beam emerging fromthe analyzer is measured as 100 Lumens. Now, if the analyzer is rotated around the horizontal axis (direction of light) by 30° in clockwise direction, the intensity of emerging light will be__________ Lumens.

Accepted Answer

75

Question 59

In connection with the circuit drawn below, the value of current flowing through 2k$\Omega$resistor is ________ $	imes 10^{-4}$ A.

Accepted Answer

25

Question 60

The gas released during anaerobic degradation of vegetation may lead to:

Accepted Answer

(A) Global warming and cancer

Answer

(B) Acid rain

Answer

(C) Corrosion of metals

Answer

(D) Ozone hole

Question 61

Out of the following, which type of interaction is responsible for the stabilisation $\alpha$−helix structure of proteins ?

Accepted Answer

(B) Hydrogen bonding

Answer

(A) Ionic bonding

Answer

(C) vander Waals forces

Answer

(D) Covalent bonding

Question 62

Which of the following are isostructural pairs ?
(A) $\mathrm{SO_4^{2-}}$ and $\mathrm{CrO_4^{2-}}$
(B) $\mathrm{SiCl_4}$ and $\mathrm{TiCl_4}$
(c) $\mathrm{NH_3}$ and $\mathrm{NO_3^{-}}$
(D) $\mathrm{BCl_3}$ and $\mathrm{BrCl_3}$

Accepted Answer

(B) A and B only

Answer

(A) A and C only

Answer

(C) B and C only

Answer

(D) C and D only

Question 63

Identify products A and B.

Accepted Answer

(B) (B)

Answer

(A) (A)

Answer

(C) (C)

Answer

(D) (D)

Question 64

The electrode potential of $\mathrm{M^{2+}/M}$ of 3d− series elements shows positive value for:

Accepted Answer

(D) Cu

Answer

(A) Zn

Answer

(B) Co

Answer

(C) Fe

JEE Main 24 February 2021 Shift 1 Question Paper with Answers

Physics — JEE Main 24 February 2021 Shift 1

Chemistry — JEE Main 24 February 2021 Shift 1

Mathematics — JEE Main 24 February 2021 Shift 1

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