JEE Main 2021 (Online) 22th July Evening Shift

Paper was held on
Thu, Jul 22, 2021 9:30 AM

## Chemistry

The water having more dissolved O2 is :

View Question Which one of the following statements for D.I. Mendeleeff, is incorrect?

View Question Which purification technique is used for high boiling organic liquid compound (decomposes near its boiling point)?

View Question Which of the following compounds will provide a tertiary alcohol or reaction with excess of CH3MgBr followed by hydrolys

View Question Which of the following compounds does not exhibit resonance?

View Question Match List-I with List-II
List-I(Elements)
List-II(Properties)
(a)
Ba
(i)

View Question In the chemical reactions given above A and B respectively are :

View Question Isotope(s) of hydrogen which emits low energy $$\beta$$$$-$$ particles with t1/2 value > 12 years is/are

View Question Match List-I with List-II :
List-I(Species)
List-II(Hybrid Orbitals)
(a)
$$S{F_4}$

View Question When silver nitrate solution is added to potassium iodide solution then the sol produced is :

View Question Which of the following molecules does not show stereo isomerism?

View Question Given below are the statements about diborane(a) Diborane is prepared by the oxidation of NaBH4 with I2(b) Each boron at

View Question Which one of the following group-15 hydride is the strongest reducing agent?

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

View Question The set having ions which are coloured and paramagnetic both is :

View Question Thiamine and pyridoxine are also known respectively as :

View Question Sulphide ion is soft base and its ores are common for metals.(a) Pb (b) Al (c) Ag (d) Mg

View Question An organic compound A (C6H6O) gives dark green colouration with ferric chloride. On treatment with CHCl3 and KOH, follow

View Question Which one of the following reactions does not occur?

View Question Which one of the following 0.06 M aqueous solutions has lowest freezing point?

View Question The total number of unpaired electrons present in [Co(NH3)6]Cl2 and [Co(NH3)6]Cl3 is :

View Question Methylation of 10 g of benzene gave 9.2 g of toluene. Calculate the percentage yield of toluene __________. (Nearest int

View Question The number of acyclic structural isomers (including geometrical isomers) for pentene are ___________

View Question Assume a cell with the following reaction$$C{u_{(s)}} + 2A{g^ + }(1 \times {10^{ - 3}}M) \to C{u^{2 + }}(0.250M) + 2A{g_

View Question Value of KP for the equilibrium reactionN2O4(g) $$\rightleftharpoons$$ 2NO2(g) at 288 K is 47.9. The KC for this reactio

View Question If the standard molar enthalpy change for combustion of graphite powder is $$-$$2.48 $$\times$$ 102 kJ mol$$-$$1, the am

View Question A copper complex crystallising in a CCP lattice with a cell edge of 0.4518 nm has been revealed by employing X-ray diffr

View Question Number of electrons that Vanadium (Z = 23) has in p-orbitals is equal to _____________

View Question $${N_2}{O_{5(g)}} \to 2N{O_{2(g)}} + {1 \over 2}{O_{2(g)}}$$In the above first order reaction the initial concentration

View Question If the concentration of glucose (C6H12O6) in blood is 0.72 g L$$-$$1, the molarity of glucose in blood is ____________ $

View Question ## Mathematics

Let L be the line of intersection of planes $$\overrightarrow r .(\widehat i - \widehat j + 2\widehat k) = 2$$ and $$\ov

View Question Let Sn denote the sum of first n-terms of an arithmetic progression. If S10 = 530, S5 = 140, then S20 $$-$$ S6 is equal

View Question Let f : R $$\to$$ R be defined as$$f(x) = \left\{ {\matrix{
{ - {4 \over 3}{x^3} + 2{x^2} + 3x,} & {x > 0} \c

View Question Let y = y(x) be the solution of the differential equation $$\cos e{c^2}xdy + 2dx = (1 + y\cos 2x)\cos e{c^2}xdx$$, with

View Question Four dice are thrown simultaneously and the numbers shown on these dice are recorded in 2 $$\times$$ 2 matrices. The pro

View Question Let a vector $${\overrightarrow a }$$ be coplanar with vectors $$\overrightarrow b = 2\widehat i + \widehat j + \wideha

View Question If $$\int\limits_0^{100\pi } {{{{{\sin }^2}x} \over {{e^{\left( {{x \over \pi } - \left[ {{x \over \pi }} \right]} \righ

View Question Let three vectors $$\overrightarrow a $$, $$\overrightarrow b $$ and $$\overrightarrow c $$ be such that $$\overrightarr

View Question The values of $$\lambda$$ and $$\mu$$ such that the system of equations $$x + y + z = 6$$, $$3x + 5y + 5z = 26$$, $$x +

View Question If the shortest distance between the straight lines $$3(x - 1) = 6(y - 2) = 2(z - 1)$$ and $$4(x - 2) = 2(y - \lambda )

View Question Which of the following Boolean expressions is not a tautology?

View Question Let A = [aij] be a real matrix of order 3 $$\times$$ 3, such that ai1 + ai2 + ai3 = 1, for i = 1, 2, 3. Then, the sum of

View Question Let [x] denote the greatest integer less than or equal to x. Then, the values of x$$\in$$R satisfying the equation $${[{

View Question Let the circle S : 36x2 + 36y2 $$-$$ 108x + 120y + C = 0 be such that it neither intersects nor touches the co-ordinate

View Question Let n denote the number of solutions of the equation z2 + 3$$\overline z $$ = 0, where z is a complex number. Then the v

View Question The number of solutions of sin7x + cos7x = 1, x$$\in$$ [0, 4$$\pi$$] is equal to

View Question If the domain of the function $$f(x) = {{{{\cos }^{ - 1}}\sqrt {{x^2} - x + 1} } \over {\sqrt {{{\sin }^{ - 1}}\left( {{

View Question Let f : R $$\to$$ R be defined as $$f(x) = \left\{ {\matrix{
{{{{x^3}} \over {{{(1 - \cos 2x)}^2}}}{{\log }_e}\left(

View Question Let a line L : 2x + y = k, k > 0 be a tangent to the hyperbola x2 $$-$$ y2 = 3. If L is also a tangent to the parabol

View Question Let $${E_1}:{{{x^2}} \over {{a^2}}} + {{{y^2}} \over {{b^2}}} = 1,a > b$$. Let E2 be another ellipse such that it tou

View Question Let A = {0, 1, 2, 3, 4, 5, 6, 7}. Then the number of bijective functions f : A $$\to$$ A such that f(1) + f(2) = 3 $$-$$

View Question If the digits are not allowed to repeat in any number formed by using the digits 0, 2, 4, 6, 8, then the number of all n

View Question Let $$A = \left[ {\matrix{
0 & 1 & 0 \cr
1 & 0 & 0 \cr
0 & 0 & 1 \cr
} } \right

View Question Consider the following frequency distribution :
.tg {border-collapse:collapse;border-spacing:0;}
.tg td{border-color:bl

View Question The sum of all the elements in the set {n$$\in$$ {1, 2, ....., 100} | H.C.F. of n and 2040 is 1} is equal to ___________

View Question The area (in sq. units) of the region bounded by the curves x2 + 2y $$-$$ 1 = 0, y2 + 4x $$-$$ 4 = 0 and y2 $$-$$ 4x $$-

View Question Let f : R $$\to$$ R be a function defined as $$f(x) = \left\{ {\matrix{
{3\left( {1 - {{|x|} \over 2}} \right)} &

View Question If the constant term, in binomial expansion of $${\left( {2{x^r} + {1 \over {{x^2}}}} \right)^{10}}$$ is 180, then r is

View Question Let y = y(x) be the solution of the differential equation $$\left( {(x + 2){e^{\left( {{{y + 1} \over {x + 2}}} \right)}

View Question The number of elements in the set {n $$\in$$ {1, 2, 3, ......., 100} | (11)n > (10)n + (9)n} is ______________.

View Question ## Physics

Choose the correct option

View Question What will be the projection of vector $$\overrightarrow A = \widehat i + \widehat j + \widehat k$$ on vector $$\overrig

View Question A Copper (Cu) rod of length 25 cm and cross-sectional area 3 mm2 is joined with a similar Aluminium (Al) rod as shown in

View Question In a circuit consisting of a capacitance and a generator with alternating emf Eg = Eg0 sin$$\omega$$t, VC and IC are the

View Question A porter lifts a heavy suitcase of mass 80 kg and at the destination lowers it down by a distance of 80 cm with a consta

View Question Consider a situation in which a ring, a solid cylinder and a solid sphere roll down on the same inclined plane without s

View Question Intensity of sunlight is observed as 0.092 Wm$$-$$2 at a point in free space. What will be the peak value of magnetic fi

View Question A body is projected vertically upwards from the surface of earth with a velocity sufficient enough to carry it to infini

View Question An electric dipole is placed on x-axis in proximity to a line charge of linear charge density 3.0 $$\times$$ 10$$-$$6 C/

View Question A nucleus with mass number 184 initially at rest emits an $$\alpha$$-particle. If the Q value of the reaction is 5.5 MeV

View Question A bullet of '4 g' mass is fired from a gun of mass 4 kg. If the bullet moves with the muzzle speed of 50 ms$$-$$1, the i

View Question Statement I : The ferromagnetic property depends on temperature. At high temperature, ferromagnet becomes paramagnet.Sta

View Question Match List - I with List - II
List - I
List - II
(a)
$$\omega L > {1 \over {\om

View Question A ray of light passes from a denser medium to a rarer medium at an angle of incidence i. The reflected and refracted ray

View Question An electron of mass me and a proton of mass mp are accelerated through the same potential difference. The ratio of the d

View Question What will be the average value of energy for a monoatomic gas in thermal equilibrium at temperature T?

View Question T0 is the time period of a simple pendulum at a place. if the length of the pendulum is reduced to $${1 \over {16}}$$ ti

View Question What should be the height of transmitting antenna and the population covered if the television telecast is to cover a ra

View Question The motion of a mass on a spring, with spring constant K is as shown in figure.The equation of motion is given by x(t) =

View Question Consider a situation in which reserve biased current of a particular P-N junction increases when it is exposed to a ligh

View Question A ray of light passing through a prism ($$\mu$$ = $$\sqrt 3 $$) suffers minimum deviation. It is found that the angle of

View Question Three students S1, S2 and S3 perform an experiment for determining the acceleration due to gravity (g) using a simple pe

View Question Three particles P, Q and R are moving along the vectors $$\overrightarrow A = \widehat i + \widehat j$$, $$\overrightar

View Question In 5 minutes, a body cools from 75$$^\circ$$C to 65$$^\circ$$C at room temperature of 25$$^\circ$$C. The temperature of

View Question In a given circuit diagram, a 5 V zener diode along with a series resistance is connected across a 50 V power supply. Th

View Question The total charge enclosed in an incremental volume of 2 $$\times$$ 10$$-$$9 m3 located at the origin is ___________ nC,

View Question The position of the centre of mass of a uniform semi-circular wire of radius 'R' placed in x-y plane with its centre at

View Question In an electric circuit, a cell of certain emf provides a potential difference of 1.25 V across a load resistance of 5$$\

View Question The area of cross-section of a railway track is 0.01 m2. The temperature variation is 10$$^\circ$$C. Coefficient of line

View Question The centre of a wheel rolling on a plane surface moves with a speed v0. A particle on the rim of the wheel at the same l

View Question