List of top Chemistry Questions asked in JEE Main

A rigid nitrogen tank stored inside a laboratory has a pressure of 30 atm at 06:00 am when the temperature is 27°C. At 03:00 pm, when the temperature is 45°C, the pressure in the tank will be _______ atm. [nearest integer]
The number of oxygens present in a nucleotide formed from a base, that is present only in RNA is ________.

Match List-I with List-II

Choose the correct answer from the options given below:
 

Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R).
Assertion (A): Experimental reaction of \(CH_3Cl\) with aniline and anhydrous \(AlCl_3\) does not give o and p-methylaniline.
Reason (R): The \(–NH_2\)group of aniline becomes deactivating because of salt formation with anhydrous \(AlCl_3\) and hence yields m-methyl aniline as the product.
In the light of the above statements, choose the most appropriate answer from the options given below :

The correct structure of product ‘A’ formed in the following reaction, 

(Ph is – C6H5) is

Which of the following is a correct statement?

Isobutyraldehyde on reaction with formaldehyde and K2CO3 gives compound ‘A’. Compound ‘A’ reacts with KCN and yields compound ‘B’, which on hydrolysis gives a stable compound ‘C’. The compound ‘C’ is

The mixture of chloroxylenol and terpineol is an example of
Which one of the following is NOT a copolymer?
The eutrophication of water body results in:
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
Concentrated \(HNO_3\) reacts with Iodine to give
Fe3+ cation gives a Prussian blue precipitate on addition of potassium ferrocyanide solution due to the formation of:
The quantity of electricity of Faraday needed to reduce \(1\) mol of \(Cr_2O_7^{2-}\) to \(Cr^{3+}\) is
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 :

Given below are two statements : one is labelled as Assertion A and the other is labelled as Reason R.
Assertion A : Dacron is an example of polyester polymer.
Reason R : Dacron is made up of ethylene glycol and terephthalic acid monomers.
In the light of the above statements, choose the most appropriate answer from the options given below.

Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R.

Assertion A: Polluted water may have a value of BOD of the order of 17 ppm.

Reason R: BOD is a measure of oxygen required to oxidise both the bio-degradable and non-biodegradable organic material in water.

In the light of the above statements, choose the most appropriate answer from the options given below.

Fig. Reaction

Consider the above reaction. The number of π electrons present in the product ‘P’ is _____ .

Stearic acid and polyethylene glycol react to form which one of the following soap/s detergents?
Which one of the following is a water soluble vitamin, that is not excreted easily?
Amongst BeF2, BF3, H2O, NH3, CCl4 and HCl, the number of molecules with non-zero net dipole moment 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:
In alanylglycylleucylalanyvaline, the number of peptide linkages is__,