JEE Main 2020 (Online) 7th January Evening Slot

Paper was held on
Tue, Jan 7, 2020 9:30 AM

## Chemistry

Consider the following reactions :
Which of these reactions are possible ?

View Question For the reaction 2H2(g) + 2NO(g) $$ \to $$ N2(g) + 2H2O(g) the observed rate expression is, rate = Kf[NO]2[H2]. The rate

View Question The correct order of stability for the following alkoxides is :

View Question In the following reaction, products (A) and (B) respectively, are :
NaOH + Cl2 $$ \to $$ (A) + side products
(hot and co

View Question The bond order and the magnetic characteristics of CN-
are :

View Question The equation that is incorrect is :

View Question The number of possible optical isomers for the complexes MA2B2 with sp3 and dsp2 hydridized metal atom. respectively, is

View Question For the following reactions
Ks and Ke, are respectively, the rate constants for substitution and elimination and $$\mu

View Question Identify the correct labels of A,B and C in the following graph from the options given below :
Root mean square speed (

View Question Two open beakers one containing a solvent and the other containing a mixture of that solvent
with a non voltatile solute

View Question The redox reaction among the following is :

View Question A chromatography column, packed with silica gel as stationary phase, was used to separate a
mixture of compounds consist

View Question The refining method used when the metal and the impurities have low and high melting temperatures, respectively, is :

View Question Which of the following statements is correct ?

View Question The ammonia (NH3) released on quantitative reaction of 0.6 g urea (NH2CONH2) with sodium hydroxide (NaOH) can be neutral

View Question Among the statements (a) - (d), the correct ones are :
(a) Decomposition of hydrogen peroxide gives dioxygen.
(b) Like h

View Question Within each pair of elements F & Cl, S & Se, and Li & Na, respectively, the elements that release
more energ

View Question Among the statements(a)-(d) the incorrect ones are :
(a) Octahedral CO(III) complexes with strong fields ligands have ve

View Question In the following reaction sequence,
The major product B is :

View Question In the following reactions sequence, structure of A and B respectively will be :

View Question Consider the following reactions :
$$NaCl{\rm{ }} + {\rm{ }}{K_2}C{r_2}{O_7} + \mathop {{H_2}S{O_4}}\limits_{(conc.)} $$

View Question The standard heat of formation $$\left( {{\Delta _f}H_{298}^0} \right)$$ of ethane (in kj/mol), if the heat of combustio

View Question 3 g of acetic acid is added to 250 mL of 0.1 M HCL and the solution made up to 500 mL. To 20 mL
of this solutions $${1 \

View Question The number of sp2 hybridised carbons present in "Aspartame" is

View Question The flocculation value of HCl for arsenic sulphide sol. is 30 m mol L-1 If H2SO4 is used for the flocculatiopn of arseni

View Question ## Mathematics

If 3x + 4y = 12$$\sqrt 2 $$ is a tangent to the ellipse
$${{{x^2}} \over {{a^2}}} + {{{y^2}} \over 9} = 1$$ for some $$a

View Question In a workshop, there are five machines and the probability of any one of them to be out of service on a day is $${{1 \ov

View Question The value of $$\alpha $$ for which
$$4\alpha \int\limits_{ - 1}^2 {{e^{ - \alpha \left| x \right|}}dx} = 5$$, is:

View Question The number of ordered pairs (r, k) for which 6.35Cr
= (k2 - 3). 36Cr + 1, where k is an integer, is :

View Question The coefficient of x7
in the expression
(1 + x)10 + x(1 + x)9
+ x2(1 + x)8
+ ......+ x10 is:

View Question Let $${a_1}$$
, $${a_2}$$
, $${a_3}$$
,....... be a G.P. such that $${a_1}$$
< 0, $${a_1}$$
+ $${a_2}$$
= 4 and $$

View Question The locus of the mid-points of the perpendiculars drawn from points on the line, x = 2y to the line
x = y is :

View Question Let $$\alpha $$ and $$\beta $$ be the roots of the equation x2
- x - 1 = 0. If pk
= $${\left( \alpha \right)^k} + {\l

View Question Let A, B, C and D be four non-empty sets. The contrapositive statement of "If A $$ \subseteq $$ B and B $$ \subseteq $$

View Question The area (in sq. units) of the region
{(x, y) $$ \in $$ R2 | 4x2 $$ \le $$ y $$ \le $$ 8x + 12} is :

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

View Question Let A = [aij] and B = [bij] be two 3 × 3 real matrices such that bij = (3)(i+j-2)aji, where i, j = 1, 2, 3.
If the deter

View Question Let y = y(x) be the solution curve of the differential equation,
$$\left( {{y^2} - x} \right){{dy} \over {dx}} = 1$$, sa

View Question If the sum of the first 40 terms of the series, 3 + 4 + 8 + 9 + 13 + 14 + 18 + 19 + ..... is (102)m, then m is equal to

View Question The value of c in the Lagrange's mean value theorem for the function ƒ(x) = x3
- 4x2
+ 8x + 11,
when x $$ \in $$ [0, 1

View Question Let the tangents drawn from the origin to the circle, x2
+ y2
- 8x - 4y + 16 = 0 touch it at the
points A and B. The (

View Question Let y = y(x) be a function of x satisfying
$$y\sqrt {1 - {x^2}} = k - x\sqrt {1 - {y^2}} $$ where k is a constant and

View Question If $$\theta $$1
and $$\theta $$2
be respectively the smallest and the largest values of $$\theta $$ in (0, 2$$\pi $$)

View Question If $${{3 + i\sin \theta } \over {4 - i\cos \theta }}$$, $$\theta $$ $$ \in $$ [0, 2$$\theta $$], is a real number, then

View Question Let X = {n $$ \in $$ N : 1 $$ \le $$ n $$ \le $$ 50}. If
A = {n $$ \in $$ X: n is a multiple of 2} and
B = {n $$ \in $$

View Question Let ƒ(x) be a polynomial of degree 5 such that x = ±1 are its critical points.
If $$\mathop {\lim }\limits_{x \to 0} \le

View Question If the foot of the perpendicular drawn from the point (1, 0, 3) on a line passing through ($$\alpha $$, 7, 1)
is
$$\left

View Question If the system of linear equations,
x + y + z = 6
x + 2y + 3z = 10
3x + 2y + $$\lambda $$z = $$\mu $$
has more than two s

View Question If the mean and variance of eight numbers 3, 7, 9, 12, 13, 20, x and y be 10 and 25 respectively,
then x.y is equal to _

View Question If the function ƒ defined on $$\left( { - {1 \over 3},{1 \over 3}} \right)$$ by
f(x) = $$\left\{ {\matrix{
{{1 \over

View Question ## Physics

The activity of a radioactive sample falls from 700 s–1 to 500 s–1 in 30 minutes. Its half life is close
to:

View Question An electron (of mass m) and a photon have the same energy E in the range of a few eV. The ratio
of the de-Broglie wavele

View Question Mass per unit area of a circular disc of radius $$a$$ depends on the distance r from its centre as $$\sigma \left( r \ri

View Question In the figure, potential difference between A and B is :

View Question A particle of mass m and charge q has an initial velocity $$\overrightarrow v = {v_0}\widehat j$$
. If an electric fiel

View Question An emf of 20 V is applied at time t = 0 to a circuit containing in series 10 mH inductor and 5 $$\Omega $$
resistor. The

View Question
The figure gives experimentally measured B vs H variation in a ferromagnetic material. The
retentivity, coercivity and

View Question A planar loop of wire rotates in a uniform magnetic field. Initially at t = 0, the plane of the loop
is perpendicular to

View Question Two ideal Carnot engines operate in cascade (all heat given up by one engine is used by the other
engine to produce work

View Question A mass of 10 kg is suspended by a rope of length 4 m, from the ceiling. A force F is applied
horizontally at the mid poi

View Question In a building there are 15 bulbs of 45 W, 15 bulbs of 100 W, 15 small fans of 10 W and 2 heaters
of 1 kW. The voltage of

View Question The dimension of $${{{B^2}} \over {2{\mu _0}}}$$, where B is magnetic field and $${{\mu _0}}$$
is the magnetic permeabi

View Question An elevator in a building can carry a maximum of 10 persons, with the average mass of each
person being 68 kg, The mass

View Question A stationary observer receives sound from two identical tuning forks, one of which approaches
and the other one recedes

View Question A thin lens made of glass (refractive index = 1.5) of focal length f = 16 cm is immersed in a liquid
of refractive index

View Question The electric field of a plane electromagnetic wave is given by
$$\overrightarrow E = {E_0}{{\widehat i + \widehat j} \o

View Question Under an adiabatic process, the volume of an ideal gas gets doubled. Consequently the mean
collision time between the ga

View Question In a Young's double slit experiment, the separation between the slits is 0.15 mm. in the experiment,
a source of light o

View Question An ideal fluid flows (laminar flow) through a pipe of non-uniform diameter. The maximum and
minimum diameters of the pip

View Question A box weight 196 N on a spring balance at the north pole. Its weight recorded on the same
balance if it is shifted to th

View Question A 60 pF capacitor is fully charged by a 20 V supply. It is then disconnected from the supply and
is conneced to another

View Question The sum of two forces $$\overrightarrow P $$
and $$\overrightarrow Q $$
is $$\overrightarrow R $$
such that $$\left|

View Question
Consider a uniform cubical box of side a on a rough floor that is to be moved by applying
minimum possible force F at a

View Question The balancing length for a cell is 560 cm in a potentiometer experiment. When an external
resistance of 10 $$\Omega $$ i

View Question M grams of steam at 100oC is mixed with 200 g of ice at its melting point in a thermally insulated
container. If it prod

View Question