JEE Main 2021 (Online) 26th February Morning Shift

Paper was held on
Fri, Feb 26, 2021 3:30 AM

## Chemistry

For the given reactionWhat is 'A'?

View Question Which of the following is 'a' FALSE statement ?

View Question Find A, B and C in the following reactions :$$N{H_3} + A + C{O_2} \to {(N{H_4})_2}C{O_3}$$$${(N{H_4})_2}C{O_3} + {H_2}O

View Question Match List - I with List - II.
List I Electronic configuration
List II $${\Delta _i}H$$ in kJ $$mo

View Question Statements about heavy water are given below :A. Heavy water is used in exchange reactions for the study of reaction mec

View Question Given below are two statements :Statement I : A mixture of chloroform and aniline can be separated by simple distillatio

View Question The presence of ozone in troposphere :

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

View Question Which one of the following lanthanoids does not form MO2? [M is lanthanoid metal]

View Question Match List - I with List - II.
List - I (Ore)
List - II (Element Present)
(a)
Kern

View Question On treating a compound with warm dil. H2SO4, gas X is evolved which turns K2Cr2O7 paper acidified with dil. H2SO4 to a g

View Question For the given reaction :What is 'A'?

View Question Compound A used as a strong oxidizing agent is amphoteric in nature. It is the part of lead storage batteries. Compound

View Question Identify the major products A and B respectively in the following reactions of phenol :

View Question The structure of Neoprene is :

View Question An amine on reaction with benzensulphonyl chloride produces a compound insoluble in alkaline solution. This amine can be

View Question Given below are two statements : Statement I : o-Nitrophenol is steam volatile due to intramolecular hydrogen bonding.St

View Question B reacts with Hydroxyl amine but does not give Tollen's test. Identify A and B.

View Question Which of the following vitamin is helpful in delaying the blood clotting?

View Question The orbital having two radial as well as two angular nodes is :

View Question For a chemical reaction A + B ⇌ C + D($${\Delta _r}{H^\Theta }$$ = 80 kJ mol$$-$$1) the entropy change $${\Delta _r}{S^\

View Question An exothermic reaction X $$ \to $$ Y has an activation energy 30 kJ mol$$-$$1. If energy change $$\Delta$$E during the r

View Question 3.12 g of oxygen is adsorbed on 1.2 g of platinum metal. The volume of oxygen adsorbed per gram of the adsorbent at 1 at

View Question The number of significant figures in 50000.020 $$\times$$ 10$$-$$3 is _____________.

View Question Dichromate ion is treated with base, the oxidation number of Cr in the product formed is ___________.

View Question Number of bridging CO ligands in [Mn2(CO)10] is __________.

View Question Consider the following reaction$$MnO_4^ - + 8{H^ + } + 5{e^ - } \to M{n^{ + 2}} + 4{H_2}O,{E^o} = 1.51V$$.The quantity

View Question 224 mL of SO2(g) at 298 K and 1 atm is passed through 100 mL of 0.1 M NaOH solution. The non-volatile solute produced is

View Question A homogeneous ideal gaseous reaction $$A{B_{2(g)}} \rightleftharpoons {A_{(g)}} + 2{B_{(g)}}$$ is carried out in a 25 li

View Question A certain gas obeys P(Vm $$-$$ b) = RT. The value of $${\left( {{{\partial Z} \over {\partial P}}} \right)_T}$$ is $${{x

View Question ## Mathematics

The maximum value of the term independent of 't' in the expansion of $${\left( {t{x^{{1 \over 5}}} + {{{{(1 - x)}^{{1 \o

View Question The value of $$\mathop {\lim }\limits_{h \to 0} 2\left\{ {{{\sqrt 3 \sin \left( {{\pi \over 6} + h} \right) - \cos \lef

View Question Let A be a symmetric matrix of order 2 with integer entries. If the sum of the diagonal elements of A2 is 1, then the po

View Question The sum of the infinite series $$1 + {2 \over 3} + {7 \over {{3^2}}} + {{12} \over {{3^3}}} + {{17} \over {{3^4}}} + {{2

View Question The value of $$\int\limits_{ - \pi /2}^{\pi /2} {{{{{\cos }^2}x} \over {1 + {3^x}}}} dx$$ is :

View Question The number of seven digit integers with sum of the digits equal to 10 and formed by using the digits 1, 2 and 3 only is

View Question Let R = {(P, Q) | P and Q are at the same distance from the origin} be a relation, then the equivalence class of (1, $$-

View Question The value of $$\sum\limits_{n = 1}^{100} {\int\limits_{n - 1}^n {{e^{x - [x]}}dx} } $$, where [ x ] is the greatest inte

View Question The intersection of three lines x $$-$$ y = 0, x + 2y = 3 and 2x + y = 6 is a :

View Question If $$\overrightarrow a $$ and $$\overrightarrow b $$ are perpendicular, then $$\overrightarrow a \times \left( {\overri

View Question A fair coin is tossed a fixed number of times. If the probability of getting 7 heads is equal to probability of getting

View Question In the circle given below, let OA = 1 unit, OB = 13 unit and PQ $$ \bot $$ OB. Then, the area of the triangle PQB (in sq

View Question The value of $$\left| {\matrix{
{(a + 1)(a + 2)} & {a + 2} & 1 \cr
{(a + 2)(a + 3)} & {a + 3} &

View Question If $${{{{\sin }^1}x} \over a} = {{{{\cos }^{ - 1}}x} \over b} = {{{{\tan }^{ - 1}}y} \over c}$$; $$0 < x < 1$$, th

View Question The maximum slope of the curve $$y = {1 \over 2}{x^4} - 5{x^3} + 18{x^2} - 19x$$ occurs at the point :

View Question The rate of growth of bacteria in a culture is proportional to the number of bacteria present and the bacteria count is

View Question Consider the three planesP1 : 3x + 15y + 21z = 9,P2 : x $$-$$ 3y $$-$$ z = 5, and P3 : 2x + 10y + 14z = 5Then, which one

View Question If (1, 5, 35), (7, 5, 5), (1, $$\lambda$$, 7) and (2$$\lambda$$, 1, 2) are coplanar, then the sum of all possible values

View Question In an increasing geometric series, the sum of the second and the sixth term is $${{25} \over 2}$$ and the product of the

View Question Let ($$\lambda$$, 2, 1) be a point on the plane which passes through the point (4, $$-$$2, 2). If the plane is perpendic

View Question If $$\sqrt 3 ({\cos ^2}x) = (\sqrt 3 - 1)\cos x + 1$$, the number of solutions of the given equation when $$x \in \left

View Question The value of the integral $$\int\limits_0^\pi {|{{\sin }\,}2x|dx} $$ is ___________.

View Question The number of solutions of the equation log4(x $$-$$ 1) = log2(x $$-$$ 3) is _________.

View Question The sum of 162th power of the roots of the equation x3 $$-$$ 2x2 + 2x $$-$$ 1 = 0 is ________.

View Question The area bounded by the lines y = || x $$-$$ 1 | $$-$$ 2 | is ___________.

View Question Let m, n$$\in$$N and gcd (2, n) = 1. If $$30\left( {\matrix{
{30} \cr
0 \cr
} } \right) + 29\left( {\matrix{

View Question The difference between degree and order of a differential equation that represents the family of curves given by $${y^2}

View Question If y = y(x) is the solution of the equation $${e^{\sin y}}\cos y{{dy} \over {dx}} + {e^{\sin y}}\cos x = \cos x$$, y(0)

View Question The number of integral values of 'k' for which the equation $$3\sin x + 4\cos x = k + 1$$ has a solution, k$$\in$$R is _

View Question Let f be any function defined on R and let it satisfy the condition : $$|f(x) - f(y)|\, \le \,|{(x - y)^2}|,\forall (x,y

View Question ## Physics

Consider the combination of 2 capacitors C1 and C2 with C2 > C1, when connected in parallel, the equivalent capacitan

View Question An alternating current is given by the equation i = i1 sin $$\omega$$t + i2 cos $$\omega$$t. The rms current will be :

View Question Four identical solid spheres each of mass 'm' and radius 'a' are placed with their centres on the four corners of a squa

View Question A large number of water drops, each of radius r, combine to have a drop of radius R. If the surface tension is T and mec

View Question LED is constructed from Ga-As-P semiconducting material. The energy gap of this LED is 1.9 eV. Calculate the wavelength

View Question A short straight object of height 100 cm lies before the central axis of a spherical mirror whose focal length has absol

View Question In a Young's double slit experiment two slits are separated by 2 mm and the screen is placed one meter away. When a ligh

View Question Assume that a tunnel is dug along a chord of the earth, at a perpendicular distance (R/2) from the earth's centre, where

View Question In a typical combustion engine the workdone by a gas molecule is given by $$W = {\alpha ^2}\beta {e^{{{ - \beta {x^2}} \

View Question If two similar springs each of spring constant K1 are joined in series, the new spring constant and time period would be

View Question A particle is moving with uniform speed along the circumference of a circle of radius R under the action of a central fi

View Question The temperature $$\theta$$ at the junction of two insulating sheets, having thermal resistances R1 and R2 as well as top

View Question Find the electric field at point P (as shown in figure) on the perpendicular bisector of a uniformly charged thin wire o

View Question A planet revolving in elliptical orbit has :A. a constant velocity of revolution.B. has the least velocity when it is ne

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

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

View Question The normal density of a material is $$\rho$$ and its bulk modulus of elasticity is K. The magnitude of increase in densi

View Question If $$\lambda$$1 and $$\lambda$$2 are the wavelengths of the third member of Lyman and first member of the Paschen series

View Question Find the gravitational force of attraction between the ring and sphere as shown in the diagram, where the plane of the r

View Question Five equal resistances are connected in a network as shown in figure. The net resistance between the points A and B is :

View Question A person standing on a spring balance inside a stationary lift measures 60 kg. The weight of that person if the lift des

View Question The circuit contains two diodes each with a forward resistance of 50$$\Omega$$ and with infinite reverse resistance. If

View Question In a series LCR resonant circuit, the quality factor is measured as 100. If the inductance is increased by two fold and

View Question The mass per unit length of a uniform wire is 0.135 g/cm. A transverse wave of the form y = $$-$$ 0.21 sin (x + 30t) is

View Question The maximum and minimum amplitude of an amplitude modulated wave is 16V and 8V respectively. The modulation index for th

View Question In an electrical circuit, a battery is connected to pass 20C of charge through it in a certain given time. The potential

View Question A boy pushes a box of mass 2 kg with a force $$\overrightarrow F = \left( {20\widehat i + 10\widehat j} \right)N$$ on a

View Question A radiation is emitted by 1000W bulb and it generates an electric field and magnetic field at P, placed at a distance of

View Question A container is divided into two chambers by a partition. The volume of first chamber is 4.5 litre and second chamber is

View Question As shown in the figure, a block of mass $$\sqrt 3 $$ kg is kept on a horizontal rough surface of coefficient of friction

View Question