JEE Main 2023 (Online) 1st February Evening Shift

The graph which represents the following reaction is :

In a reaction,

reagents 'X' and 'Y' respectively are :

The structures of major products A, B and C in the following reaction are sequence.

All structures given below are of vitamin C. Most stable of them is :

Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R).
Assertion (A) : \(\alpha\)-halocarboxylic acid on reaction with dil. \(\mathrm{NH_3}\) gives good yield of \(\alpha\)-amino carboxyli...

Testosterone, which is a steroidal hormone, has the following structure.

The total number of asymmetric carbon atom/s in testosterone is ____________.

\(\mathrm{O}-\mathrm{O}\) bond length in \(\mathrm{H}_{2} \mathrm{O}_{2}\) is \(\underline{\mathrm{X}}\) than the \(\mathrm{O}-\mathrm{O}\) bond length in \(\mathrm{F}_{2} \mathrm{O}_{2}\). The \(\mathrm{O}-\mathrm{H}\) bond length in $$\ma...

The effect of addition of helium gas to the following reaction in equilibrium state, is :
\(\mathrm{PCl}_{5}(\mathrm{g}) \rightleftharpoons \mathrm{PCl}_{3}(\mathrm{g})+\mathrm{Cl}_{2}(\mathrm{g})\)

\(\mathrm{A}\) \(\rightarrow \mathrm{B}\)
The above reaction is of zero order. Half life of this reaction is \(50 \mathrm{~min}\). The time taken for the concentration of \(\mathrm{A}\) to reduce to one-fourth of its initial value is ______...

Among the following, the number of tranquilizer/s is/are ___________.
A. Chloroliazepoxide
B. Veronal
C. Valium
D. Salvarsan

The complex cation which has two isomers is :

The spin only magnetic moment of \(\left[\mathrm{Mn}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}\right]^{2+}\) complexes is _________ B.M. (Nearest integer)
(Given : Atomic no. of Mn is 25)

Which element is not present in Nessler's reagent?

Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R).
Assertion (A) : \(\mathrm{Cu^{2+}}\) in water is more stable than \(\mathrm{Cu^{+}}\).
Reason (R) : Enthalpy of hydration for $$\math...

Among following compounds, the number of those present in copper matte is ___________.
A. \(\mathrm{CuCO_{3}}\)
B. \(\mathrm{Cu_{2}S}\)
C. \(\mathrm{Cu_{2}O}\)
D. \(\mathrm{FeO}\)

Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R)
Assertion (A) : An aqueous solution of \(\mathrm{KOH}\) when used for volumetric analysis, its concentration should be checked before ...

\(1 \times 10^{-5} ~\mathrm{M} ~\mathrm{AgNO}_{3}\) is added to \(1 \mathrm{~L}\) of saturated solution of \(\mathrm{AgBr}\). The conductivity of this solution at \(298 \mathrm{~K}\) is _____________ $$\times 10^{-8} \mathrm{~S} \mathrm{~m}...

The industrial activity held least responsible for global warming is :

'\(\mathrm{X}\)' is :

The starting material for convenient preparation of deuterated hydrogen peroxide (\(\mathrm{D_{2}O_{2}}\)) in :

The correct order of bond enthalpy (\(\mathrm{kJ~mol^{-1}}\)) is :

For electron gain enthalpies of the elements denoted as \(\Delta_{\mathrm{eg}} \mathrm{H}\), the incorrect option is :

Given below are two statements :
Statement I : Sulphanilic acid gives esterification test for carboxyl group.
Statement II : Sulphanilic acid gives red colour in Lassigne's test for extra element detection.
In the light of the above stateme...

Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R).
Assertion (A) : Gypsum is used for making fireproof wall boards.
Reason (R) : Gypsum is unstable at high temperatures.
In the light o...

A metal M crystallizes into two lattices :- face centred cubic (fcc) and body centred cubic (bcc) with unit cell edge length of \(2.0\) and \(2.5\,\mathop A\limits^o\) respectively. The ratio of densities of lattices fcc to bcc for the met...

\(20 \%\) of acetic acid is dissociated when its \(5 \mathrm{~g}\) is added to \(500 \mathrm{~mL}\) of water. The depression in freezing point of such water is _________ \(\times 10^{-3}{ }^{\circ} \mathrm{C}\).
Atomic mass of $$\mathrm{C},...

The molality of a \(10 \%(\mathrm{v} / \mathrm{v})\) solution of di-bromine solution in \(\mathrm{CCl}_{4}\) (carbon tetrachloride) is '\(x\)'. \(x=\) ____________ \(\times 10^{-2} ~\mathrm{M}\). (Nearest integer)
[Given : molar mass of $$\...

Which one of the following sets of ions represents a collection of isoelectronic species?
(Given : Atomic Number : \(\mathrm{F:9,Cl:17,Na=11,Mg=12,Al=13,K=19,Ca=20,Sc=21}\))

In figure, a straight line is given for Freundrich Adsorption (\(y=3x+2.505\)). The value of \(\frac{1}{n}\) and \(\log \mathrm{K}\) are respectively.

\(0.3 \mathrm{~g}\) of ethane undergoes combustion at \(27^{\circ} \mathrm{C}\) in a bomb calorimeter. The temperature of calorimeter system (including the water) is found to rise by \(0.5^{\circ} \mathrm{C}\). The heat evolved during combu...