List of top Questions asked in JEE Main- 2023

Product [X] formed in the above reaction is:

Which of the following compounds is an example of Freon?

Given below are two statements:
Statement I : Ethene at 333 to 343 K and 6-7 atm pressure in the presence of AIEt₃ and TiCl₄ undergoes addition polymerization to give LDP.
Statement II: Caprolactam at 533-543 K in H₂O through step growth polymerizes to give Nylon 6.
In the light of the above statements, choose the correct answer from the options given below:

If Ni^2– is replaced by Pt^2– in the complex NiCl₂Br₂] ^2– , which of the following properties are expected to get changed?
A. Geometry
B. Geometrical isomerism
C. Optical isomerism
D. Magnetic properties

Match List I with List II

LIST I Complex		LIST II Colour
A.	Mg(NH4)PO4	I.	brown
B.	K3[Co(NO2)6]	II.	white
C.	MnO(OH)2	III.	yellow
D.	Fe4[Fe(CN)6]3	IV.	blue

Choose the correct answer from the options given below:

The major product formed in the following reaction is
 
A.
B.
C.
D.
Choose the correct answer from the options given below:

Which one of the following pairs is an example of polar molecular solids ?

Given below arc two statements:
Statement I : In the metallurgy process. sulphide ore is converted to oxide before reduction.
Statement II : Oxide ores in general are easier to reduce.
In the light of the above statements, choose the most appropriate answer from the options given below

Compound ‘B’ is

Given below are two statements, one is labelled as Assertion A and the other is labelled as Reason R.
Assertion A: [CoCl(NH₃)]^2– absorbs at lower wavelength of light with respect to [Co(NH₃)₅(H₂O) ^3–
Reason R: It is because the wavelength of the light absorbed depends on the oxidation state of the metal ion.
In the light of the above statements, choose the correct answer from the options given below:

Mg(NO₃)₂. XH₂O and Ba(NO₃)₂.YH₂O, represent formula of the crystalline forms of nitrate salts. Sum of X and Y is _____________ .

The total number of intensive properties from the following is __________
Volume. Molar heat capacity, Molarity, E^θ cell. Gibbs free energy change. Molar mass, Mole

The maximum number of lone pairs of electron on the central atom from the following species is ___________
ClO₃^– , XeF₄, SF₄ and I₃^–

The number of correct statements from the following is ______
A. E^cell is an intensive parameter
B. A negative E^θ means that the redox couple is a stronger reducing agent than the H^– H₂ couple.
C. The amount of electricity required for oxidation or reduction depends on the stoichiometry of the electrode reaction.
D. The amount of chemical reaction which occurs at any electrode during electrolysis by a current is proportional to the quantity of electricity passed through the electrolyte.

The number of correct statements about modern adsorption theory of heterogeneous catalysis from the following is _______
A. The catalyst is diffused over the surface of reactants.
B. Reactants are adsorbed on the surface of the catalyst.
C. Occurrence of chemical reaction on the catalysts surface through formation of an intermediate.
D. It is a combination of intermediate compound formation theory and the old adsorption theory
E. It explains the action of the catalyst as well as those of catalytic promoters and poisons.

Number of compounds from the following which will not produce orange red precipitate with Benedict solution is ____________
Glucose, maltose, sucrose, ribose, 2-deoxyribose, amylose, lactose

The number of correct statement from the following is _________ .
A. For 1s orbital, the probability density is maximum at the nucleus
B. For 2s orbital, the probability density first increases to maximum and then decreases sharply to zero.
C. Boundary surface diagram of the orbitals encloses a region of 100% probability of finding the electron.
D. p and d-orbitals have 1 and 2 angular nodes respectively E. probability density of p-orbital is zero at the nucleus

The volume of hydrogen liberated at STP by treating 2.4 g of magnesium with excess of hydrochloric acid is _________ × 10^–2 L
Given : Molar volume of gas is 22.4 L at STP.
Molar mass of magnesium is 24 g mol^–1

The number of possible isomeric products formed when 3-chioro-1-butene reacts with HCl through carbocation formation is __________

4.5 moles each of hydrogen and iodine is heated in a sealed ten litre vessel. At equilibrium, 3 moles of HI were found. The equilibrium constant for H₂(g) + I₂(g) ⇋ 2HI(g) is _____________ .

In the equation \(\bigg[X + {\frac{a}{Y^2}}\bigg] [Y - b] = RT\), X is pressure, Y is volume, R is universal gas constant and T is temperature. The physical quantity equivalent to the ratio \(\frac{a}{b}\) is 

Given below are two statements :
Statement I: For a planet, if the ratio of mass of the planet to its radius increases, the escape velocity from the planet also increases. 
Statement II: Escape velocity is independent of the radius of the planet. 
In the light of above statements, choose the most appropriate answer from the option given below:

Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R 
Assertion A : A spherical body of radius (5 ± 0.1) mm having a particular density is falling through a liquid of constant density. The percentage error in the calculation of its terminal velocity is 4%. 
Reason R : The terminal velocity of the spherical body falling through the liquid is inversely proportional to its radius. 

The radii of two planets 'A' and 'B' are 'R' and '4R' and their densities are \( \rho \) and \( \frac{\rho}{3} \) respectively. The ratio of acceleration due to gravity at their surfaces (i.e. \( g_A : g_B \)) will be:

The initial pressure and volume of an ideal gas are P₀ and V₀. The final pressure of the gas when the gas is suddenly compressed to volume \(\frac{V_0}{4}\) will be(Given γ = ratio of specific heats at constant pressure and at constant volume)