JEE Main 2020 (Online) 8th January Evening Slot

Paper was held on
Wed, Jan 8, 2020 9:30 AM

## Chemistry

Among the reactions (a) - (d), the reaction(s)
that does/do not occur in the blast furnace
during the extraction of iron

View Question Kjeldahl's method cannot be used to estimate
nitrogen for which of the following
compounds?

View Question Consider the following plots of rate constant
versus $${1 \over T}$$ for four different reactions. Which
of the followin

View Question An unsaturated hydrocarbon X absorbs two
hydrogen molecules on catalytic hydrogenation and also gives following reaction

View Question The increasing order of the atomic radii of the
following elements is :-
(a) C (b) O (c) F (d) Cl
(e) Br

View Question Among the compounds A and B with
molecular formula C9H18O3 , A is having higher
boiling point the B. The possible struct

View Question The major product [B] in the following
sequence of reactions is :-

View Question A metal (A) on heating in nitrogen gas gives
compound B. B on treatment with H2O gives
a colourless gas which when passe

View Question Which of the following compounds is likely to
show both Frenkel and Schottky defects in its
crystalline form?

View Question Arrange the following bonds according to their
average bond energies in descending order :
C–Cl, C–Br, C–F, C–I

View Question For the following Assertion and Reason, the
correct option is :
Assertion : The pH of water increases with
increase in t

View Question The radius of the second Bohr orbit, in terms
of the Bohr radius, a0, in Li2+ is :

View Question Among (a) – (d) the complexes that can display
geometrical isomerism are :
(a) [Pt(NH3)3Cl]+
(b) [Pt(NH3)Cl5]–
(c) [Pt(

View Question The major product in the following reaction is:

View Question Two monomers in maltose are :

View Question White Phosphorus on reaction with concentrated
NaOH solution in an inert atmosphere of CO2
gives phosphine and compound

View Question Hydrogen has three isotopes (A), (B) and (C).
If the number of neutron(s) in (A), (B) and (C)
respectively, are (x), (y)

View Question Preparation of Bakelite proceeds via reactions.

View Question The correct order of the calculated spin-only
magnetic moments of complexs (A) to (D) is:
(A) Ni(CO)4
(B) [Ni(H2O)6]Cl2

View Question For the following Assertion and Reason, the
correct option is
Assertion : For hydrogenation reactions, the
catalytic act

View Question For an electrochemical cell
Sn(s) | Sn2+ (aq,1M)||Pb2+ (aq,1M)|Pb(s)
the ratio $${{\left[ {S{n^{2 + }}} \right]} \over {

View Question NaClO3 is used, even in spacecrafts, to produce
O2. The daily consumption of pure O2 by a
person is 492L at 1 atm, 300K.

View Question In the following sequence of reactions the
maximum number of atoms present in
molecule 'C' in one plane is _________.
(

View Question At constant volume, 4 mol of an ideal gas when
heated from 300 K to 500K changes its internal
energy by 5000 J. The mola

View Question Complexes (ML5) of metals Ni and Fe have
ideal square pyramidal and trigonal
bipyramidal grometries, respectively. The s

View Question ## Mathematics

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

View Question The area (in sq. units) of the region
{(x,y) $$ \in $$ R2 : x2 $$ \le $$ y $$ \le $$ 3 – 2x}, is :

View Question The length of the perpendicular from the origin,
on the normal to the curve, x2 + 2xy – 3y2 = 0
at the point (2,2) is

View Question If $$I = \int\limits_1^2 {{{dx} \over {\sqrt {2{x^3} - 9{x^2} + 12x + 4} }}} $$, then :

View Question Let S be the set of all functions ƒ : [0,1] $$ \to $$ R,
which are continuous on [0,1] and differentiable
on (0,1). Then

View Question If a line, y = mx + c is a tangent to the circle,
(x – 3)2 + y2 = 1 and it is perpendicular to a line L1, where L1 is th

View Question Which of the following statements is a tautology?

View Question If the 10th term of an A.P. is $${1 \over {20}}$$ and its 20th term
is $${1 \over {10}}$$, then the sum of its first 200

View Question Let ƒ : (1, 3) $$ \to $$ R be a function defined by
$$f(x) = {{x\left[ x \right]} \over {1 + {x^2}}}$$ , where [x] denot

View Question If $$\alpha $$ and $$\beta $$ be the coefficients of x4 and x2
respectively in the expansion of
$${\left( {x + \sqrt {{x

View Question The system of linear equations
$$\lambda $$x + 2y + 2z = 5
2$$\lambda $$x + 3y + 5z = 8
4x + $$\lambda $$y + 6z = 10 has

View Question If $${{\sqrt 2 \sin \alpha } \over {\sqrt {1 + \cos 2\alpha } }} = {1 \over 7}$$ and $$\sqrt {{{1 - \cos 2\beta } \over

View Question If $$A = \left( {\matrix{
2 & 2 \cr
9 & 4 \cr
} } \right)$$ and $$I = \left( {\matrix{
1 & 0

View Question The mirror image of the point (1, 2, 3) in a plane
is $$\left( { - {7 \over 3}, - {4 \over 3}, - {1 \over 3}} \right)$$.

View Question Let S be the set of all real roots of the equation,
3x(3x – 1) + 2 = |3x – 1| + |3x – 2|. Then S :

View Question The differential equation of the family of
curves, x2 = 4b(y + b), b $$ \in $$ R, is :

View Question $$\mathop {\lim }\limits_{x \to 0} {{\int_0^x {t\sin \left( {10t} \right)dt} } \over x}$$ is equal to

View Question The mean and variance of 20 observations are
found to be 10 and 4, respectively. On
rechecking, it was found that an obs

View Question Let A and B be two events such that the
probability that exactly one of them occurs is $${2 \over 5}$$ and the probabili

View Question Let $$\alpha = {{ - 1 + i\sqrt 3 } \over 2}$$. If $$a = \left( {1 + \alpha } \right)\sum\limits_{k = 0}^{100} {{\alpha

View Question If a hyperbola passes through the point
P(10, 16) and it has vertices at (± 6, 0), then the
equation of the normal to it

View Question Let ƒ(x) be a polynomial of degree 3 such that
ƒ(–1) = 10, ƒ(1) = –6, ƒ(x) has a critical point
at x = –1 and ƒ'(x) has

View Question The sum, $$\sum\limits_{n = 1}^7 {{{n\left( {n + 1} \right)\left( {2n + 1} \right)} \over 4}} $$ is equal to
________.

View Question Let a line y = mx (m > 0) intersect the parabola,
y2 = x at a point P, other than the origin. Let
the tangent to it a

View Question The number of 4 letter words (with or without
meaning) that can be formed from the eleven
letters of the word 'EXAMINATI

View Question ## Physics

As shown in figure, when a spherical cavity
(centered at O) of radius 1 is cut out of a uniform
sphere of radius R (cent

View Question In a double slit experiment, at a certain point
on the screen the path difference between the
two interfering waves is $

View Question A plane electromagnetic wave of frequency
25 GHz is propagating in vacuum along the
z-direction. At a particular point i

View Question A galvanometer having a coil resistance
100 $$\Omega $$ gives a full scale deflection when a
current of 1 mA is passed t

View Question A particle of mass m and charge q is released
from rest in a uniform electric field. If there is
no other force on the p

View Question A simple pendulum is being used to determine
th value of gravitational acceleration g at a
certain place. Th length of t

View Question Two liquids of densities $${\rho _1}$$ an $${\rho _2}$$ ($${\rho _2}$$ = 2$${\rho _1}$$) are
filled up behind a square w

View Question A transverse wave travels on a taut steel wire
with a velocity of v when tension in it is
2.06 × 104 N. When the tension

View Question A shown in the figure, a battery of emf $$\varepsilon $$ is
connected to an inductor L and resistance R in
series. The s

View Question A capacitor is made of two square plates each
of side 'a' making a very small angle $$\alpha $$ between
them, as shown i

View Question A very long wire ABDMNDC is shown in
figure carrying current I. AB and BC parts are
straight, long and at right angle. A

View Question A particle of mass m is dropped from a height
h above the ground. At the same time another
particle of the same mass is

View Question A carnot engine having an efficiency of $${1 \over {10}}$$ is
being used as a refrigerator. If the work done
on the refr

View Question Consider a mixture of n moles of helium gas
and 2n moles of oxygen gas (molecules taken
to be rigid) as an ideal gas. It

View Question A uniform sphere of mass 500 g rolls without
slipping on a plane horizontal surface with its
centre moving at a speed of

View Question An electron (mass m) with initial velocity $$\overrightarrow v = {v_0}\widehat i + {v_0}\widehat j$$ is in an electric

View Question Consider two charged metallic spheres S1 and
S2 of radii R1 and R2, respectively. The electric
fields E1 (on S1) and E2

View Question A particle moves such that its position
vector $$\overrightarrow r \left( t \right) = \cos \omega t\widehat i + \sin \om

View Question In the given circuit, value of Y is :

View Question An object is gradually moving away from the
focal point of a concave mirror along the axis
of the mirror. The graphical

View Question Three containers C1, C2 and C3 have water at
different temperatures. The table below shows
the final temperature T when

View Question A ball is dropped from the top of a 100 m high
tower on a planet. In the last $${1 \over 2}s$$ before hitting
the ground

View Question The first member of the Balmer series of
hydrogen atom has a wavelength of 6561 Å.
The wavelength of the second member o

View Question An asteroid is moving directly towards the
centre of the earth. When at a distance of
10R (R is the radius of the earth)

View Question The series combination of two batteries, both
of the same emf 10 V, but different internal
resistance of 20$$\Omega $$ a

View Question