List of top Questions asked in JEE Main

On the surface of polar stratospheric clouds, hydrolysis of chlorine nitrate gives A and B while its reaction with HCl produces B and C. A, B and C are, respectively
Fe3+ cation gives a Prussian blue precipitate on addition of potassium ferrocyanide solution due to the formation of:
100 mL of 5% (w/v) solution of NaCl in water was prepared in 250 mL beaker. Albumin from the egg was poured into NaCl solution and stirred well. This resulted in a/an :
Among the following which is the strongest oxidizing agent?
Arrange the following carbocations in decreasing order of stability.
carbocations
Which one of the following is a water soluble vitamin, that is not excreted easily?

The final product ‘C’ in the following series of reactions

Refining using the liquation method is the most suitable for metals with:
Amongst BeF2, BF3, H2O, NH3, CCl4 and HCl, the number of molecules with non-zero net dipole moment is ______.
In alanylglycylleucylalanyvaline, the number of peptide linkages is__,
For a first order reaction \(A → B\), the rate constant, \(k = 5.5×10^{–14}s^{–1}\). The time required for 67% completion of reaction is \(x×10^{–1}\) times the half life of reaction. The value of \(x\) is _____. (Nearest integer)
The drug tegamet is:
Match List-I with List-II
List-I(Mixture) List-II(Purification Process)
(A) Chloroform & Aniline(I) Steam distillation
(B) Benzoic acid & Napthalene(II) Sublimation
(C) Water & Aniline(III) Distillation
(D) Napthalene & Sodium chloride(IV) Crystallisation
Choose the correct answer from the options given below:

The major product in the following reaction is:
 

Fig. Chemical Reaction

The reagent, from the following, which converts benzoic acid to benzaldehyde in one step is

The difference in the reaction of phenol with bromine in chloroform and bromine in water medium is due to:
The difference between spin only magnetic moment value of \([Co(H_2O)_6]Cl_2\) and \([Cr(H_2O)_6]Cl_3\) is ________ .
Which of the following is the correct plot for the probability density ψ2(r) as a function of distance ‘r’ of the electron from the nucleus for 2s orbital?

Match List-I with List-II:
 

List-I (Oxide)List-II (Nature)
(A) Cl2O7(I) Amphoteric
(B) Na2O(II) Basic
(C) Al2O3(III) Neutral
(D) N2O(IV) Acidic


Choose the correct answer from the options given below:

\((C_7H_5O_2)_2\stackrel{ℎv}{→} [X]→2C_6H_5+2CO_2\)
Consider the above reaction and identify the intermediate ‘X’

Cerium (IV) has a noble gas configuration. Which of the following is correct statement about it?

Match List I with List II.

 List I List II
AZymaseIStomach
BDiastaseIIYeast
CUreaseIIIMalt
DPepsinIVSoyabean

Choose the correct answer from the options given below.

Which one of the following reactions indicates the reducing ability of hydrogen peroxide in basic medium?
Amongst SF4, XeF4, CF4 and H2O, the number of species with two lone pair of electrons is _____.
A white precipitate was formed when BaCl2 was added to water extract of an inorganic salt. Further, a gas ‘X’ with characteristic odour was released when the formed white precipitate was dissolved in dilute HCl. The anion present in the inorganic salt is