JEE Main 2021 (Online) 26th February Evening Shift

Paper was held on
Fri, Feb 26, 2021 9:30 AM

## Chemistry

Match List - I with List - II.
List - I (Molecule)
List - II (Bond order)
(a)
$$N{

View Question
Ceric ammonium nitrate and CHCl3/alc. KOH are used for the identification of functional groups present in __________ and

View Question
In $$\mathop C\limits^1 {H_2} = \mathop C\limits^2 = \mathop C\limits^3 H - \mathop C\limits^4 {H_3}$$ molecule, the hy

View Question
A. Phenyl methanamineB. N,N-DimethylanilineC. N-Methyl anilineD. BenzenamineChoose the correct order of basic nature of

View Question
Match List - I with List - II.
List - I
List - II
(a)
Sodium Carbonate
(i)

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

View Question
Which of the following forms of hydrogen emits low energy $$\beta$$- particles?

View Question
Which pair of oxides is acidic in nature?

View Question
Identify A in the given reaction.

View Question
Match List - I with List - II.Choose the correct answer from the options given below :

View Question
Identify A in the following chemical reaction.

View Question
2, 4-DNP test can be used to identify :

View Question
Considering the above reaction, the major product among the following is :

View Question
Identify A in the given chemical reaction.

View Question
Match List - I with List - II.
List - I
List - II
(a)
Siderite
(i)
Cu

View Question
The correct order of electron gain enthalpy is :

View Question
The nature of charge on resulting colloidal particles when FeCl3 is added to excess of hot water is :

View Question
Match List - I with List - II.
List - I
List - II
(a)
Sucrose
(i)
$$\beta

View Question
Calgon is used for water treatment. Which of the following statement is NOT true about Calgon?

View Question
Seliwanoff test and Xanthoproteic test are used for the identification of ___________ and ________ respectively.

View Question
When 12.2 g of benzoic acid is dissolved in 100 g of water, the freezing point of solution was found to be $$-$$0.93$$^\

View Question
If the activation energy of a reaction is 80.9 kJ mol$$-$$1, the fraction of molecules at 700 K, having enough energy to

View Question
The number of octahedral voids per lattice site in a lattice is _________. (Rounded off to the nearest integer)

View Question
In mildly alkaline medium, thiosulphate ion is oxidized by $$MnO_4^ - $$ to "A". The oxidation state of sulphur in "A" i

View Question
The average S-F bond energy in kJ mol$$-$$1 of SF6 is _____________. (Rounded off to the nearest integer)[Given : The va

View Question
Emf of the following cell at 298K in V is x $$\times$$ 10$$-$$2.Zn|Zn2+(0.1 M)||Ag+ (0.01 M)|AgThe value of x is _______

View Question
The pH of ammonium phosphate solution, if pka of phosphoric acid and pkb of ammonium hydroxide are 5.23 and 4.75 respect

View Question
The number of stereoisomers possible for [Co(ox)2(Br)(NH3)]2$$-$$ is ___________. [ox = oxalate]

View Question
A ball weighing 10 g is moving with a velocity of 90 ms$$-$$1. If the uncertainty in its velocity is 5%, then the uncert

View Question
The NaNO3 weighed out to make 50 mL of an aqueous solution containing 70.0 mg Na+ per mL is _________ g. (Rounded off to

View Question
## Mathematics

Let f(x) be a differentiable function at x = a with f'(a) = 2 and f(a) = 4. Then $$\mathop {\lim }\limits_{x \to a} {{xf

View Question
Let A(1, 4) and B(1, $$-$$5) be two points. Let P be a point on the circle (x $$-$$ 1)2 + (y $$-$$ 1)2 = 1 such that (PA

View Question
Let F1(A, B, C) = (A $$ \wedge $$ $$ \sim $$ B) $$ \vee $$ [$$\sim$$C $$\wedge$$ (A $$\vee$$ B)] $$\vee$$ $$\sim$$ A and

View Question
Consider the following system of equations :x + 2y $$-$$ 3z = a2x + 6y $$-$$ 11z = bx $$-$$ 2y + 7z = c,where a, b and c

View Question
A natural number has prime factorization given by n = 2x3y5z, where y and z are such that y + z = 5 and y$$-$$1 + z$$-$$

View Question
If 0 < a, b < 1, and tan$$-$$1a + tan$$-$$1b = $${\pi \over 4}$$, then the value of $$(a + b) - \left( {{{{a^2} +

View Question
Let $$f(x) = \int\limits_0^x {{e^t}f(t)dt + {e^x}} $$ be a differentiable function for all x$$\in$$R. Then f(x) equals :

View Question
For x > 0, if $$f(x) = \int\limits_1^x {{{{{\log }_e}t} \over {(1 + t)}}dt} $$, then $$f(e) + f\left( {{1 \over e}} \

View Question
If the mirror image of the point (1, 3, 5) with respect to the plane 4x $$-$$ 5y + 2z = 8 is ($$\alpha$$, $$\beta$$, $$\

View Question
Let $$A = \{ 1,2,3,....,10\} $$ and $$f:A \to A$$ be defined as$$f(k) = \left\{ {\matrix{
{k + 1} & {if\,k\,is\,o

View Question
Let A1 be the area of the region bounded by the curves y = sinx, y = cosx and y-axis in the first quadrant. Also, let A2

View Question
Let $$f(x) = {\sin ^{ - 1}}x$$ and $$g(x) = {{{x^2} - x - 2} \over {2{x^2} - x - 6}}$$. If $$g(2) = \mathop {\lim }\limi

View Question
Let slope of the tangent line to a curve at any point P(x, y) be given by $${{x{y^2} + y} \over x}$$. If the curve inter

View Question
Let f : R $$ \to $$ R be defined as $$f(x) = \left\{ \matrix{
2\sin \left( { - {{\pi x} \over 2}} \right),if\,x <

View Question
The triangle of maximum area that can be inscribed in a given circle of radius 'r' is :

View Question
If the locus of the mid-point of the line segment from the point (3, 2) to a point on the circle, x2 + y2 = 1 is a circl

View Question
The sum of the series $$\sum\limits_{n = 1}^\infty {{{{n^2} + 6n + 10} \over {(2n + 1)!}}} $$ is equal to :

View Question
If vectors $$\overrightarrow {{a_1}} = x\widehat i - \widehat j + \widehat k$$ and $$\overrightarrow {{a_2}} = \wideha

View Question
A seven digit number is formed using digits 3, 3, 4, 4, 4, 5, 5. The probability, that number so formed is divisible by

View Question
Let L be a line obtained from the intersection of two planes x + 2y + z = 6 and y + 2z = 4. If point P($$\alpha$$, $$\be

View Question
The total number of 4-digit numbers whose greatest common divisor with 18 is 3, is _________.

View Question
If the matrix $$A = \left[ {\matrix{
1 & 0 & 0 \cr
0 & 2 & 0 \cr
3 & 0 & { - 1} \c

View Question
Let $$\alpha$$ and $$\beta$$ be two real numbers such that $$\alpha$$ + $$\beta$$ = 1 and $$\alpha$$$$\beta$$ = $$-$$1.

View Question
Let z be those complex numbers which satisfy| z + 5 | $$ \le $$ 4 and z(1 + i) + $$\overline z $$(1 $$-$$ i) $$ \ge $$ $

View Question
Let the normals at all the points on a given curve pass through a fixed point (a, b). If the curve passes through (3, $$

View Question
If the arithmetic mean and geometric mean of the pth and qth terms of the sequence $$-$$16, 8, $$-$$4, 2, ...... satisfy

View Question
If $${I_{m,n}} = \int\limits_0^1 {{x^{m - 1}}{{(1 - x)}^{n - 1}}dx} $$, for m, $$n \ge 1$$, and $$\int\limits_0^1 {{{{x^

View Question
Let X1, X2, ......., X18 be eighteen observations such that $$\sum\limits_{i = 1}^{18} {({X_i} - } \alpha ) = 36$$ and $

View Question
Let a be an integer such that all the real roots of the polynomial 2x5 + 5x4 + 10x3 + 10x2 + 10x + 10 lie in the interva

View Question
Let L be a common tangent line to the curves 4x2 + 9y2 = 36 and (2x)2 + (2y)2 = 31. Then the square of the slope of the

View Question
## Physics

Draw the output signal Y in the given combination of gates.

View Question
An aeroplane, with its wings spread 10 m, is flying at a speed of 180 km/h in a horizontal direction. The total intensit

View Question
Find the peak current and resonant frequency of the following circuit (as shown in figure).

View Question
A scooter accelerates from rest for time t1 at constant rate a1 and then retards at constant rate a2 for time t2 and com

View Question
A radioactive sample is undergoing $$\alpha$$ decay. At any time t1, its activity is A and another time t2, the activity

View Question
Given below are two statements: Statement I : An electric dipole is placed at the center of a hollow sphere. The flux of

View Question
If 'C' and 'V' represent capacity and voltage respectively then what are the dimensions of $$\lambda$$ where C/V = $$\la

View Question
The recoil speed of a hydrogen atom after it emits a photon in going from n = 5 state to n = 1 state will be :

View Question
A wire of 1$$\Omega$$ has a length of 1 m. It is stretched till its length increases by 25%. The percentage change in re

View Question
The incident ray, reflected ray and the outward drawn normal are denoted by the unit vectors $$\overrightarrow a $$, $$\

View Question
The internal energy (U), pressure (P) and volume (V) of an ideal gas are related as U $$=$$ 3PV + 4. The gas is :

View Question
The length of metallic wire is l1 when tension in it is T1. It is l2 when the tension is T2. The original length of the

View Question
The trajectory of a projectile in a vertical plane is y = $$\alpha$$x $$-$$ $$\beta$$x2, where $$\alpha$$ and $$\beta$$

View Question
Given below are two statements : one is labeled as Assertion A and the other is labeled as Reason R.Assertion A : For a

View Question
An inclined plane making an angle of 30$$^\circ$$ with the horizontal is placed in a uniform horizontal electric field $

View Question
Two masses A and B, each of mass M are fixed together by a massless spring. A force acts on the mass B as shown in the f

View Question
A cord is wound round the circumference of wheel of radius r. The axis of the wheel is horizontal and the moment of iner

View Question
A particle executes S.H.M., the graph of velocity as a function of displacement is :

View Question
A tuning fork A of unknown frequency produces 5 beats/s with a fork of known frequency 340 Hz. When fork A is field, the

View Question
Given below are two statements :Statement I : A second's pendulum has a time period of 1 second.Statement II : It takes

View Question
1 mole of rigid diatomic gas performs a work of $${Q \over 5}$$ when heat Q is supplied to it. The molar heat capacity o

View Question
A particle executes S.H.M. with amplitude 'a', and time period 'T'. The displacement of the particle when its speed is h

View Question
Time period of a simple pendulum is T. The time taken to complete $${5 \over 8}$$ oscillations starting from mean positi

View Question
The zener diode has a Vz = 30V. The current passing through the diode for the following circuit is ________ mA.

View Question
The volume V of a given mass of monoatomic gas changes with temperature T according to the relation $$V = K{T^{{2 \over

View Question
27 similar drops of mercury are maintained at 10V each. All these spherical drops combine into a single big drop. The po

View Question
A point source of light S, placed at a distance 60cm in front of the centre of a plane mirror of width 50 cm, hangs ver

View Question
In the reported figure of earth, the value of acceleration due to gravity is same at point A and C but it is smaller tha

View Question
Two stream of photons, possessing energies equal to twice and ten times the work function of metal are incident on the m

View Question
If the highest frequency modulating a carrier is 5 kHz, then the number of AM broadcast stations accommodated in a 90 kH

View Question