JEE Main 2020 (Online) 7th January Morning Slot
Paper was held on
Tue, Jan 7, 2020 3:30 AM
Chemistry
Two solutions, A and B, each of 100L was made by dissolving 4g of NaOH and 9.8 g of H2SO4 in water, respectively. The pH
View Question Chlorine reacts with hot and concentrated NaOH and produces compounds (X) and (Y). Compound
(X) gives white precipitate
View Question For the reaction :
A($$l$$) $$ \to $$ 2B(g)
$$\Delta U = 2.1\,kcal,\,\Delta S = 20\,cal\,{K^{ - 1}}$$ at 300 K
Hence $$\
View Question During the nuclear explosion, one of the products is 90Sr with half life of 6.93 years. If 1 $$\mu $$ g of 90Sr was abso
View Question The number of orbitals associated with quantum number n = 5, ms = +$${1 \over 2}$$ is :
View Question What is the product of following reaction ?
View Question Consider the following reaction :
The product 'X' is used :
View Question Given that the standard potentials (Eo) of Cu2+/Cu and Cu+/Cu are 0.34 V and 0.522 V respectively, the Eo of Cu2+/Cu+ :
View Question Consider the following reaction :
$${\left( {C{H_3}} \right)_3}CCH\left( {OH} \right)C{H_3}\buildrel {conc.\,\,\,{H_2}S{
View Question The dipole of CCl4, CHCl3 and CH4 are in the order :
View Question Amongst the following statements, that which was not proposed by Dalton was :
View Question Match the following :
(i) Riboflavin (a) Beriberi
(ii) Thiamine (b) Scurvy
(iii) Pyr
View Question The relative strength of interionic/intermolecular forces in decreasing order is :
View Question The IUPAC name of complex [Pt(NH3)2Cl(NH2CH3)]Cl is:
View Question 1- methyl ethylene oxide when treated with an excess of HBr produces :
View Question The electron gain enthalpy (in KJ/mol) of fluorine, chlorine, bromine and iodine, respectively are:
View Question A solution of m-chloronailimne, m-chlorophenol and m-chlorobenzoic acid in ethyal acetate was extracted initially with a
View Question The increasing order to Pkb for the following compounds will be :
View Question At 35oC, the vapour pressure of CS2
is 512 mm. Hg and that of acetone is 344 mm Hg. A solution
of CS2
in acetone has a
View Question Oxidation number of potassium in K2O. K2O2 and KO2 respectively is :
View Question The theory that can completely/properly explain the nature of bonding in [Ni(Co)4] is :
View Question The atomic radius of Ag is closed to :
View Question Mathematics
Total number of 6-digit numbers in which only and all the five digits 1, 3, 5, 7 and 9 appear, is :
View Question If $${\mathop{\rm Re}\nolimits} \left( {{{z - 1} \over {2z + i}}} \right) = 1$$, where z = x + iy, then the point (x, y)
View Question Let $$\alpha $$ and $$\beta $$ be two real roots of the equation (k + 1)tan2x - $$\sqrt 2 $$ . $$\lambda $$tanx = (1 - k
View Question A vector $$\overrightarrow a = \alpha \widehat i + 2\widehat j + \beta \widehat k\left( {\alpha ,\beta \in R} \right)$
View Question Let $$\alpha $$ be a root of the equation x2 + x + 1 = 0 and the matrix A = $${1 \over {\sqrt 3 }}\left[ {\matrix{
1
View Question Let xk + yk = ak, (a, k > 0 ) and $${{dy} \over {dx}} + {\left( {{y \over x}} \right)^{{1 \over 3}}} = 0$$, then k is
View Question If the system of linear equations
2x + 2ay + az = 0
2x + 3by + bz = 0
2x + 4cy + cz = 0,
where a, b, c $$ \in $$ R are n
View Question $$\mathop {\lim }\limits_{x \to 2} {{{3^x} + {3^{3 - x}} - 12} \over {{3^{ - x/2}} - {3^{1 - x}}}}$$ is equal to_______
View Question If the variance of the first n natural numbers is 10 and the variance of the first m even natural
numbers is 16, then m
View Question Let A(1, 0), B(6, 2) and C $$\left( {{3 \over 2},6} \right)$$ be the vertices of a triangle ABC. If P is a Point inside
View Question Let S be the set of points where the function, ƒ(x) = |2-|x-3||, x $$ \in $$ R is not differentiable. Then $$\sum\limits
View Question Five numbers are in A.P. whose sum is 25 and product is 2520. If one of these five numbers is -$${1 \over 2}$$ , then th
View Question If y = y(x) is the solution of the differential equation, $${e^y}\left( {{{dy} \over {dx}} - 1} \right) = {e^x}$$ such t
View Question If $$y\left( \alpha \right) = \sqrt {2\left( {{{\tan \alpha + \cot \alpha } \over {1 + {{\tan }^2}\alpha }}} \right) +
View Question If g(x) = x2 + x - 1 and (goƒ) (x) = 4x2 - 10x + 5, then ƒ$$\left( {{5 \over 4}} \right)$$ is equal to:
View Question If ƒ(a + b + 1 - x) = ƒ(x), for all x, where a and b are fixed positive real numbers, then
$${1 \over {a + b}}\int_a^b {
View Question The greatest positive integer k, for which 49k + 1 is a factor of the sum 49125 + 49124 + ..... + 492 + 49 + 1, is:
View Question An unbiased coin is tossed 5 times. Suppose that a variable X is assigned the value of k when k
consecutive heads are ob
View Question The area of the region, enclosed by the circle x2 + y2 = 2 which is not common to the region bounded by the parabola y2
View Question If the distance between the foci of an ellipse is 6 and the distance between its directrices is 12,
then the length of i
View Question Physics
A satellite of mass m is launched vertically upwards with an initial speed u from the surface of the earth. After it rea
View Question A beam of electromagnetic radiation of intensity 6.4 × 10–5 W/cm2 is comprised of wavelength,
$$\lambda $$ = 310 nm. It
View Question Visible light of wavelength 6000 $$ \times $$ 10-8 cm falls normally on a single slit and produces a diffraction pattern
View Question If the magnetic field in a plane electromagnetic wave is given by
$$\overrightarrow B $$ = 3 $$ \times $$ 10-8 sin(1.6 $
View Question A particle (m = 1 kg) slides down a frictionless track (AOC) starting from rest at a point A (height 2 m). After reachin
View Question The current I1 (in A) flowing through 1 $$\Omega $$ resistor in the following circuit is :
View Question If we need a magnification of 375 from a compound microscope of tube length 150 mm and an objective of focal length 5 mm
View Question Which of the following gives a reversible operation?
View Question
As shown in the figure, a bob of mass m is tied by a massless string whose other end portion is wound on a fly wheel (d
View Question A litre of dry air at STP expands adiabatically to a volume of 3 litres. If $$\gamma $$ = 1.40, the work done by air is
View Question The time period of revolution of electron in its ground state orbit in a hydrogen atom is 1.6 $$ \times $$ 10-16 s. The
View Question Two moles of an ideal gas with $${{{C_P}} \over {{C_V}}} = {5 \over 3}$$
are mixed with 3 moles of another ideal gas
wit
View Question Speed of a transverse wave on a straight wire (mass 6.0 g, length 60 cm and area of cross-section 1.0 mm2) is 90 ms-1. I
View Question Two infinite planes each with uniform surface charge density to are kept in such a way that the angle between them is 30
View Question A long solenoid of radius R carries a time (t) - dependent current I(t)=I0t(1 - t). A ring of radius 2R is placed coaxia
View Question The radius of gyration of a uniform rod of length $$l$$, about an axis passing through a
point $${l \over 4}$$ away from
View Question A polarizer - analyser set is adjusted such that the intensity of light coming out of the analyser is just 10% of the or
View Question Consider a circular coil of wire carrying constant current I, forming a magnetic dipole. The magnetic flux through an in
View Question A 60 HP electric motor lifts an elevator having a maximum total load capacity of 2000 kg. If the frictional force on the
View Question A loop ABCDEFA of straight edges has six corner points A(0, 0, 0), B(5, 0, 0), C(5, 5, 0), D (0, 5,
0), E(0, 5, 5) and F
View Question
A parallel plate capacitor has plates of area A separated by distance 'd' between them. It is filled with a dielectric
View Question A LCR circuit behaves like a damped harmonic oscillator. Comparing it with a physical spring-mass damped oscillator havi
View Question Three point particles of masses 1.0 kg, 1.5 kg and 2.5 kg are placed at three corners of a right angle triangle of sides
View Question A non-isotropic solid metal cube has coefficients of linear expansion as : 5 $$ \times $$ 10-5/oC along the x-axis and 5
View Question