List of top Questions asked in JEE Main- 2023

The correct order of hydration enthalpies is 
(A) K+ 
(B) Rb2+ 
(C) Mg2+ 
(D) Cs+ 
(E) Ca2+ 
Choose the correct answer from the options given below:

The statement/s which are true about antagonists from the following is/are:
A. They bind to the receptor site.
B. Get transferred inside the cell for their action.
C. Inhibit the natural communication of the body.
D. Mimic the natural messenger.
Choose the correct answer from the options given below:
ClF5 at room temperature is:
The pair of lanthanides will exceptionally high 3rd ionisation enthalpy than neighbouring elements:
The standard electrode potential of M+/M in aqueous solution does not depend on

Correct order of strength of H-bond in the following -:
(A) Liquid water
(B) Ice 
(C) Impure water

Four gases A, B, C and D have critical temperatures 5.3, 33.2, 126.0 and 154.3K respectively. For their adsorption on fixed amount of charcoal, the correct order is :

The correct order of basicity of oxides of vanadium is

Compound P is neutral. Q gives effervescence with NaHCO3
Compound P is neutral. Q gives effervescence with NaHCO3 while R reacts with Hinsbergs reagent to give solid soluble in NaOH. Compound P is
Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R)
Assertion (A): $Cu ^{2+}$ in water is more stable than $Cu ^{+}$
Reason (R): Enthalpy of hydration for $Cu ^{2+}$ is much less than that of $Cu ^{+}$ 
In the light of the above statements, choose the correct answer from the options given below :
Out of the following which has maximum CFSE? ( consider with sign)
When the hydrogen ion concentration $\left[ H ^{+}\right]$changes by a factor of $1000$ , the value of $pH$ of the solution_____
The major product formed in the following reaction is
Match the following List-I and List-II:
List-IIndustryList-IIWaste Generated
(A)Steel Plants(I)Gypsum
(B)Thermal Power Plants(II)Fly ash
(C)Fertilizer industries(III)Slag
(D)Ppaer mills(IV)Bio-degradable Wastes
Choose the correct answer from the options given below:
During the qualitative analysis of \( SO_{3}^{-2}\) using dilute H2SO4, SO2 gas evolved which turns K2Cr2O7 solution (acidified H2SO4)
CH3CH2-Br \(\overrightarrow{Acetone}^{NaI}\) CH3-CH2-I+NaBr
Which of the following statement is correct ? 

The Lewis acid character of boron tri halides follows the order :

Given below are two statements, one is labelled as Assertion A and the other is labelled as Reason R
Assertion A: Beryllium has less negative value of reduction potential compared to the other alkaline earth metals
Reason R: Beryllium has large hydration energy due to small size of \(Be ^{2+}\) but relatively large value of atomization enthalpy
In the light of the above statements, choose the most appropriate answer from the options given below

Thin layer chromatography of a mixture shows the following observation:
Thin layer chromatography

The correct order of elution in the silica gel column chromatography is .
A point charge of $10\, \mu C$ is placed at the origin At what location on the $X$-axis should a point charge of $40 \, \mu C$ be placed so that the net electric field is zero at $x=2 \, cm$ on the $X$-axis?

The magnitude of magnetic induction at the mid-point O due to the current arrangement shown in the figure is:
Ques Fig

If a planet has mass equal to 16 times the mass of earth, and radius equal to 4 times that of earth. The ratio of escape speed of a planet to that of earth is?

Given below are two statements:  
Statement I : The diamagnetic property depends on temperature.  
Statement II : The included magnetic dipole moment in a diamagnetic sample is always opposite to the magnetizing field.  
In the light of given statement, choose the correct answer from the options given below: 

The temperature at which the kinetic energy of oxygen molecules becomes double than its value at 27°C is
Light wave travelling in air along $x$-direction is given by $E_y=540 \sin \pi \times 10^4(x-c t) Vm ^{-1}$ Then, the peak value of magnetic field of wave will be (Given $c =3 \times 10^8 ms ^{-1}$ )