JEE Main 2021 (Online) 24th February Morning Shift

What is the final product (major) 'A' in the given reaction ?

Which of the following compound gives pink colour on reaction with phthalic anhydride in
conc. H2SO4 followed by treatment with NaOH ?

Which of the following reagent is used for the following reaction ?
\(\mathrm{CH}_3 \mathrm{CH}_2 \mathrm{CH}_3 \stackrel{?}{\longrightarrow} \mathrm{CH}_3 \mathrm{CH}_2 \mathrm{CHO}\)

Out of the following, which type of interaction is reponsible for the stabilisation of \(\alpha\)-helix structure of proteins ?

Which of the following are isostructural pairs ?
A. \(SO_4^{2 - }\) and \(CrO_4^{2 - }\)
B. SiCl4, and TiCl4
C. NH3 and NO3-
D. BCl3 and BrCl3

At 1990 K and 1 atm pressure, there are equal number of Cl2, molecules and Cl atoms in the
reaction mixture. The value of Kp for the reaction Cl2 (g) \(\rightleftharpoons\) 2Cl(g) under the above conditions
is x \(\times\) 10-1.
The val...

The stepwise formation of \({\left[ {Cu{{\left( {N{H_3}} \right)}_4}} \right]^{2 + }}\) is given below:

The value of stability constants K1, K2, K3 and K4 are 104, 1.58 x 103, 5 x 102 and 102 respectively. The overall equilibrium constants...

For the reaction A(g) \(\to\) B(g) the value of the equilibrium constant at 300 K and 1 atm is equal to 100.0. The value of \(\Delta\)rG for the reaction at 300 K and 1 atm in J mol-1 is – xR, where x is _______. (Rounded off to the near...

Gaseous cyclobutene isomerises to butadiene in a first order process which has a 'k' value of 3.3 \(\times\) 10-4 s-1 at 153°C. The time in minutes it takes for the isomerization to proceed 40% to completion at this temperature is ______....

'A' and 'B' in the following reactions are :

In the following reaction the reason why meta-nitro product also formed is :

Given below are two statements :
Statement I : Colourless cupric metaborate is reduced to cuprous metaborate in a luminous
flame.
Statement II : Cuprous metaborate is obtained by heating boric anhydride and copper
sulphate in a non-luminous...

The electrode potential of M2+/M of 3d-series elements shows positive value for :

The gas released during anaerobic degradation of vegetation may lead to :

What is the major product formed by HI on reaction with

The product formed in the first step of the reaction of

with excess \(\mathrm{Mg/Et_2O}\) (\(\mathrm{Et=C_2H_5}\)) is

Identify products A and B.

(A) HOCI + H2O2 → H3O+ + Cl- + O2
(B) I2 + H2O2 + 2OH- → 2I- + 2H2O + O2
Choose the correct option.

Which of the following ore is concentrated using group 1 cyanide salt ?

The major components in "Gun Metal” are :

The reaction of sulphur in alkaline medium is given below:

The values of 'a' is _______.
(Integer answer)

Al2O3 was leached with alkali to get X. The solution of X on passing of gas Y, forms Z.
X, Y and Z respectively are :

Number of amphoteric compounds among the following is ________.
(A) BeO
(B) BaO
(C) Be(OH)2
(D) Sr(OH)2

Consider the elements Mg, Al, S, P and Si, the correct increasing order of their first ionization
enthalpy is :

Match List I with List II.

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The coordination number of an atom in a body-centered cubic structure is _______.
[Assume that the lattice is made up of atoms.]

When 9.45 g of CICH2COOH is added to 500 mL of water, its freezing point drops by 0.5°C. The dissociation constant of CICH2COOH is x \(\times\) 10-3. The value of x is ________. (Rounded
off to the nearest integer)
[Kf(H20) = 1.86 K kg mo...

4.5 g of compound A (MW = 90) was used to make 250 mL of its aqueous solution. The
molarity of the solution in M is x \(\times\) 10-1. The value of x is _______. (Rounded off to the nearest integer)

A proton and a Li3+ nucleus are accelerated by the same potential. If \(\lambda _{Li}\) and \(\lambda _p\) denote the
de Broglie wavelengths of Li3+ and proton respectively, then the value of
\({{{\lambda _{Li}}} \over {{\lambda _p}}}\) is ...

In Freundlich adsorption isotherm, slope of AB line is :