JEE Main 2021 (Online) 25th February Morning Shift

Paper was held on
Thu, Feb 25, 2021 3:30 AM

## Chemistry

The solubility of AgCN in a buffer solution of pH = 3 is x. The value of x is : [Assume : No cyano complex is formed; Ks

View Question Which one of the following reactions will not form acetaldehyde?

View Question The plots of radial distribution functions for various orbitals of hydrogen atom against 'r' are given below :
The corre

View Question Identify A in the given chemical reaction.

View Question Given below are two statements :Statement I : CeO2 can be used for oxidation of aldehydes and ketones.Statement II : Aqu

View Question Compound(s) which will liberate carbon dioxide with sodium bicarbonate solution is/are :

View Question Identify A and B in the chemical reaction.

View Question Which of the glycosidic linkage between galactose and glucose is present in lactose?

View Question According to molecular orbital theory, the species among the following that does not exist is :

View Question Complete combustion of 1.80 g of an oxygen containing compound (CxHyOz) gave 2.64 g of CO2 and 1.08 g of H2O. The percen

View Question The hybridization and magnetic nature of $${[Mn{(CN)_6}]^{4 - }}$$ and $${[Fe{(CN)_6}]^{3 - }}$$, respectively are :

View Question The major product of the following chemical reaction is :

View Question In which of the following pairs, the outer most electronic configuration will be the same?

View Question Which of the following reaction/s will not give p-aminoazobenzene?

View Question Using the provided information in the following paper chromatogram :Fig : Paper chromatography for compounds A and B.the

View Question The reaction of cyanamide, NH2CN(s) with oxygen was run in a bomb calorimeter and $$\Delta$$U was found to be $$-$$742.2

View Question The ionization enthalpy of Na+ formation from Na(g) is 495.8 kJ mol$$-$$1, while the electron gain enthalpy of Br is $$-

View Question 0.4 g mixture of NaOH, Na2CO3 and some inert impurities was first titrated with $${N \over {10}}$$ HCl using phenolphtha

View Question In basic medium $$Cr{O_4}^{2 - }$$ oxidises $${S_2}{O_3}^{2 - }$$ to form $$S{O_4}^{2 - }$$ and itself changes into $$Cr

View Question Consider the following chemical reaction.
The number of sp2 hybridized carbon atom(s) present in the product is ________

View Question 1 molal aqueous solution of an electrolyte A2B3 is 60% ionised. The boiling point of the solution at 1 atm is _________

View Question Among the following, the number of halide(s) which is/are inert to hydrolysis is _________.(A) BF3(B) SiCl4(C) PCl5(D) S

View Question For the reaction, aA + bB $$ \to $$ cC + dD, the plot of log k vs $${1 \over T}$$ is given below :The temperature at whi

View Question ## Mathematics

When a missile is fired from a ship, the probability that it is intercepted is $${1 \over 3}$$ and the probability that

View Question The equation of the line through the point (0, 1, 2) and perpendicular to the line $${{x - 1} \over 2} = {{y + 1} \over

View Question The value of $$\int\limits_{ - 1}^1 {{x^2}{e^{[{x^3}]}}} dx$$, where [ t ] denotes the greatest integer $$ \le $$ t, is

View Question The integer 'k', for which the inequality x2 $$-$$ 2(3k $$-$$ 1)x + 8k2 $$-$$ 7 > 0 is valid for every x in R, is :

View Question The total number of positive integral solutions (x, y, z) such that xyz = 24 is :

View Question If a curve passes through the origin and the slope of the tangent to it at any point (x, y) is $${{{x^2} - 4x + y + 8} \

View Question Let f, g : N $$ \to $$ N such that f(n + 1) = f(n) + f(1) $$\forall $$ n$$\in$$N and g be any arbitrary function. Which

View Question Let the lines (2 $$-$$ i)z = (2 + i)$$\overline z $$ and (2 $$+$$ i)z + (i $$-$$ 2)$$\overline z $$ $$-$$ 4i = 0, (here

View Question $$\mathop {\lim }\limits_{n \to \infty } {\left( {1 + {{1 + {1 \over 2} + ........ + {1 \over n}} \over {{n^2}}}} \right

View Question Let $$\alpha$$ be the angle between the lines whose direction cosines satisfy the equations l + m $$-$$ n = 0 and l2 + m

View Question The value of the integral $$\int {{{\sin \theta .\sin 2\theta ({{\sin }^6}\theta + {{\sin }^4}\theta + {{\sin }^2}\the

View Question The coefficients a, b and c of the quadratic equation, ax2 + bx + c = 0 are obtained by throwing a dice three times. The

View Question The image of the point (3, 5) in the line x $$-$$ y + 1 = 0, lies on :

View Question The locus of the point of intersection of the lines $$\left( {\sqrt 3 } \right)kx + ky - 4\sqrt 3 = 0$$ and $$\sqrt 3 x

View Question The graphs of sine and cosine functions, intersect each other at a number of points and between two consecutive points o

View Question The total number of numbers, lying between 100 and 1000 that can be formed with the digits 1, 2, 3, 4, 5, if the repetit

View Question If $$A = \left[ {\matrix{
0 & { - \tan \left( {{\theta \over 2}} \right)} \cr
{\tan \left( {{\theta \over

View Question Let A1, A2, A3, ....... be squares such that for each n $$ \ge $$ 1, the length of the side of An equals the length of d

View Question If the system of equationskx + y + 2z = 13x $$-$$ y $$-$$ 2z = 2$$-$$2x $$-$$2y $$-$$4z = 3has infinitely many solutions

View Question The number of points, at which the function f(x) = | 2x + 1 | $$-$$ 3| x + 2 | + | x2 + x $$-$$ 2 |, x$$\in$$R is not di

View Question Let $$\overrightarrow a = \widehat i + 2\widehat j - \widehat k$$, $$\overrightarrow b = \widehat i - \widehat j$$ and

View Question Let f(x) be a polynomial of degree 6 in x, in which the coefficient of x6 is unity and it has extrema at x = $$-$$1 and

View Question ## Physics

A proton, a deuteron and an $$\alpha$$ particle are moving with same momentum in a uniform magnetic field. The ratio of

View Question A solid sphere of radius R gravitationally attracts a particle placed at 3R from its centre with a force F1. Now a spher

View Question An $$\alpha$$ particle and a proton are accelerated from rest by a potential difference of 200V. After this, their de Br

View Question The angular frequency of alternating current in a L-C-R circuit is 100 rad/s. The components connected are shown in the

View Question Magnetic fields at two points on the axis of a circular coil at a distance of 0.05 m and 0.2 m from the centre are in th

View Question Match List - I with List - II :
List I
List II
(a)
h (Planck's constant)
(i)

View Question Two satellites A and B of masses 200 kg and 400 kg are revolving round the earth at height of 600 km and 1600 km respect

View Question Two coherent light sources having intensity in the ratio 2x produce an interference pattern. The ratio $${{{I_{\max }} -

View Question An engine of a train, moving with uniform acceleration, passes the signal-post with velocity u and the last compartment

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

View Question The pitch of the screw gauge is 1 mm and there are 100 divisions on the circular scale. When nothing is put in between t

View Question If the time period of a two meter long simple pendulum is 2s, the acceleration due to gravity at the place where pendulu

View Question A diatomic gas, having $${C_p} = {7 \over 2}R$$ and $${C_v} = {5 \over 2}R$$, is heated at constant pressure. The ratio

View Question A 5V battery is connected across the points X and Y. Assume D1 and D2 to be normal silicon diodes. Find the current supp

View Question A student is performing the experiment of resonance column. The diameter of the column tube is 6 cm. The frequency of th

View Question In an octagon ABCDEFGH of equal side, what is the sum of $$\overrightarrow {AB} + \overrightarrow {AC} + \overrightarr

View Question The current (i) at time t = 0 and t = $$\infty $$ respectively for the given circuit is :

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

View Question A small bob tied at one end of a thin string of length 1 m is describing a vertical circle so that the maximum and minim

View Question A monoatomic gas of mass 4.0 u is kept in an insulated container. Container is moving with velocity 30 m/s. If container

View Question The same size images are formed by a convex lens when the object is placed at 20 cm or at 10 cm from the lens. The focal

View Question A coil of inductance 2 H having negligible resistance is connected to a source of supply whose voltage is given by V = 3

View Question The potential energy (U) of a diatomic molecule is a function dependent on r (interatomic distance) as $$U = {\alpha \o

View Question The electric field in a region is given by $$\overrightarrow E = \left( {{3 \over 5}{E_0}\widehat i + {4 \over 5}{E_0}\

View Question In a certain thermodynamical process, the pressure of a gas depends on its volume as kV3. The work done when the tempera

View Question 512 identical drops of mercury are charged to a potential of 2V each. The drops are joined to form a single drop. The po

View Question A transmitting station releases waves of wavelength 960 m. A capacitor of 2.56 $$\mu$$F is used in the resonant circuit.

View Question