JEE Main 2020 (Online) 9th January Morning Slot

Identify (A) in the following reaction sequence :

The increasing order of basicity for the
following intermediates is (from weak to
strong)

If the magnetic moment of a dioxygen species
is 1.73 B.M, it may be :

For the following reactions
\(A\buildrel {700K} \over \longrightarrow {\mathop{\rm Product}\nolimits}\)
\(A\mathrel{\mathop{\kern0pt\longrightarrow} \limits_{catalyst}^{500K}} {\mathop{\rm Product}\nolimits}\)
it was found that Ea is dec...

A chemist has 4 samples of artificial sweetener
A, B, C and D. To identify these samples, he
performed certain experiments and noted the
following observations :
(i) A and D both form blue-violet colour with
ninhydrin.
(ii) Lassaigne extrac...

The mass percentage of nitrogen in histamine is _____.

The major product Z obtained in the following
reaction scheme is :

[Pd(F)(Cl)(Br)(I)]2– has n number of
geometrical isomers. Then, the spin-only
magnetic moment and crystal field stabilisation
energy [CFSE] of [Fe(CN)6]n–6, respectively,
are:
[Note : Ignore the pairing energy]

Complex X of composition Cr(H2O)6Cln
has a spin only magnetic moment of 3.83
BM. It reacts with AgNO3 and shows
geometrical isomerism. The IUPAC
nomenclature of X is :

108 g of silver (molar mass 108 g mol–1) is
deposited at cathode from AgNO3(aq) solution
by a certain quantity of electricity. The
volume (in L) of oxygen gas produced at
273 K and 1 bar pressure from water by the
same quantity of electrici...

Which of these will produce the highest yield
in Friedel Crafts reaction?

The correct order of heat of combustion for
following alkadienes is :

The major product (Y) in the following
reactions is :

The Ksp for the following dissociation is
1.6 × 10–5
\(PbC{l_{2(s)}} \leftrightharpoons Pb_{(aq)}^{2 + } + 2Cl_{(aq)}^ -\)
Which of the following choices is correct for
a mixture of 300 mL 0.134 M Pb(NO3)2 and
100 mL 0.4 M NaCl ?

According to the following diagram, A reduces
BO2 when the temperature is :

'X' melts at low temperature and is a bad
conductor of electricity in both liquid and solid
state. X is :

The acidic, basic and amphoteric oxides,
respectively, are :

The electronic configurations of bivalent
europium and trivalent cerium are
(atomic number : Xe = 54, Ce = 58, Eu = 63)

B has a smaller first ionization enthalpy than
Be. Consider the following statements :
(I) It is easier to remove 2p electron than 2s
electron
(II) 2p electron of B is more shielded from the
nucleus by the inner core of electrons than
the 2...

The compound that cannot act both as oxidising
and reducing agent is :

How much amount of NaCl should be added
to 600 g of water (\(\rho\) = 1.00 g/mL) to decrease
the freezing point of water to – 0.2 °C ?
______.
(The freezing point depression constant for water = 2K kg mol–1)

The hardness of a water sample containing
10–3 M MgSO4 expressed as CaCO3 equivalents
(in ppm) is ______.
(molar mass of MgSO4 is 120.37 g/mol)

The molarity of HNO3 in a sample which has
density 1.4 g/mL and mass percentage of 63%
is _____.
(Molecular Weight of HNO3 = 63)

The de Broglie wavelength of an electron in the
4th Bohr orbit is :

If enthalpy of atomisation for Br2(1) is x kJ/mol
and bond enthalpy for Br2 is y kJ/mol, the
relation between them :