List of top Questions asked in JEE Main- 2023

An indicator ' X ' is used for studying the effect of variation in concentration of iodide : on the rate of reaction of iodide ion with $H_2O_2 $ at room temp. The indicator ' X ' forms blue colored complex with compound ' A ' present in the solution. The indicator ' X ' and compound 'A' respectively are

Match List I and List II

List II	List II
A. Osmosis	I. Solvent molecules pass through semi permeable membrane towards solvent side.
B. Reverse osmosis	II. Movement of charged colloidal particles under the influence of applied electric  potential towards  oppositely charged electrodes.
C. Electro osmosis	III. Solvent molecules pass through semi permeable  membrane towards solution side.
D. Electrophoresis	IV. Dispersion medium moves in an electric field.

Choose the correct answer from the options given below :

The concentration of dissolved Oxygen in water for growth of fish should be more than 𝑋 ppm and Biochemical Oxygen Demand in clean water should be less than 𝑌 ppm. X and Y in ppm are, respectively.

Find out the major product for the following reaction.

The major component of which of the following ore is sulphide based mineral?

Given below are two statements :
Statement I : The decrease in first ionization enthalpy from B to Al is much larger than that from Al to Ga.
Statement II : The d orbitals in Ga are completely filled. In the light of the above statements,
choose the most appropriate answer from the options given below

A solution of \(C_rO_5 \) in amyl alcohol has a _____ colour.

Which of the following relations are correct? 
(A) \(ΔU=q+pΔV\)
(B) \(ΔG=ΔH−TΔS\)
(C) \(ΔS=\frac{𝑞_{𝑟𝑒𝑣}}{𝑇}\)
(D) \(ΔH=ΔU−ΔnRT\)
Choose the most appropriate answer from the options given below:

Correct order of spin only magnetic moment of the following complex ions is:
(Given At.no. Fe: 26, Co:27)

Find out the major products from the following reaction sequence.

When a hydrocarbon A undergoes combustion in the presence of air, it requirs 9.5 equivalents of oxygen and produces 3 equivalents of water. What is the molecular formula of A?

Following tetrapeptide can be represented as

(F, L, D, Y, I, Q, P are one letter codes for amino acids)

Reaction of propanamide with $Br_2/KOH(aq)$ produces :

Match List I and List II

List II	List II
A. van't Hoff factor, i	I. Cryoscopic constant
B. $k_f$	II. Isotonic solutions
C. Solution with same  with same osmotic pressure	III.  Normal molar mass /Abnormal molar mass
D. Azeotropes	IV. Solutions with same composition of  vapour above it

Choose the correct answer from the options given below :

A doctor prescribed the drug Equanil to a patient. The patient was likely to have symptoms of which disease?

The one giving maximum number of isomeric alkenes on dehydrohalogenation reaction is
(excluding rearrangement)

Match List I and List II

List II	List II
A. Elastomeric polymer	I. Urea formaldehyde resin
B. Fibre Polymer	II. Polystyrene
C. Thermosetting Polymer	III. Polyester
D. Thermoplastic Polymer	IV. Neoprene

Choose the correct answer from the options given below :

Given below are two statements: 
Statement I: Nickel is being used as the catalyst for producing syn gas and edible fats. 
Statement II : Silicon forms both electron rich and electron deficient hydrides. 
In the light of the above statements, choose the most appropriate answer from the options given below:

The set of correct statements is :
(i) Manganese exhibits +7 oxidation state in its oxide. 
(ii) Ruthenium and Osmium exhibit +8 oxidation in their oxides. 
(iii) Sc shows +4 oxidation state which is oxidizing in nature. 
(iv) Cr shows oxidising nature in +6 oxidation state.

According to MO theory the bond orders for \(O_2^{2−},CO\,\, \text {and} \,\,NO^+\) respectively, are

Let $𝑆={𝑤_1,𝑤_2,…….}$ be the sample space associated to a random experiment. Let $𝑃(𝑤_𝑛)= \frac{𝑃(𝑤_{𝑛−1})}{2} ,𝑛≥2.$ Let 𝐴=${(2𝑘+3𝑙:k,𝑙∈ℕ)}$ and $𝐵={𝑤_𝑛:𝑛∈𝐴}$. Then 𝑃( 𝐵) is equal to

The statement B⇒((∼A) ∨ B) is equivalent to :

The number of 3 digit numbers, that are divisible by either 3 or 4 but not divisible by 48, is

Consider a function f:N→R, satisfying
$ f(1)+2f(2)+3f(3)+⋯+xf(x)=x(x+1)f(x);x≥2 with f(1)=1.$
Then $\frac{1}{f(2022)} + \frac{1}{f(2028)}$ is equal to $

Let 𝐾 be the sum of the coefficients of the odd powers of 𝑥 in the expansion of $(1+𝑥)^{99}$. Let 𝑎 be the middle term in the expansion of \((2+\frac{1}{\sqrt 2} )^{200}\). If $\frac{⁡^{200}𝐶_{99} 𝐾}{𝑎} =\frac{2^𝑙 𝑚}{𝑛} $, where 𝑚 and 𝑛 are odd numbers, then the ordered pair (𝑙, 𝑛) is equal to