List of top Chemistry Questions asked in JEE Main

When 35 mL of 0.15 M lead nitrate solution is mixed with 20 mL of 0.12 M chromic sulphate solution, _________ \(\times\) \(10^{-5}\) moles of lead sulphate precipitate out. (Round off to the Nearest Integer).

Sulphurous acid (\(\mathrm{H_2SO_3}\)) has \(\mathrm{Ka_1}\) = 1.7 \(\times\) \(10^{-2}\) and \(\mathrm{Ka_2}\) = 6.4 \(\times\) \(10^{-8}\). The pH of 0.588 M \(\mathrm{H_2SO_3}\) is __________. (Round off to the Nearest Integer).

Which of the following polymer is used in the manufacture of wood laminates?

The INCORRECT statement regarding the structure of \(\mathrm{C_{60}}\) is :

Which of the following reduction reaction CANNOT be carried out with coke?

The green house gas/es is (are) :

(A) Carbon dioxide

(B) Oxygen

(C) Water vapour

(D) Methane

Choose the most appropriate answer from the options given below :

Statement I : Sodium hydride can be used as an oxidising agent.

Statement II : The lone pair of electrons on nitrogen in pyridine makes it basic.

Choose the CORRECT answer from the options given below :

Identify the elements X and Y using the ionisation energy values given below :

	1st ionization energy (kJ/mol)	2nd ionization energy (kJ/mol)
X	495	4563
Y	731	1450

Arrange the following metal complex/compounds in the increasing order of spin only magnetic moment. Presume all the three, high spin system.

(Atomic numbers Ce = 58, Gd = 64 and Eu = 63)

(a) \(\mathrm{(NH_4)_2[Ce(NO_3)_6]}\)

(b) \(\mathrm{Gd(NO_3)_3}\) and

(c) \(\mathrm{Eu(NO_3)_3}\)

In the above reaction, the reagent "A" is :

Identify the reagent(s) 'A' and condition(s) for the reaction

Which of the following is least basic?

Ammonolysis of Alkyl halides followed by the treatment with NaOH solution can be used to prepare primary, secondary and tertiary amines. The purpose of NaOH in the reaction is :

The exact volumes of 1 M NaOH solution required to neutralise 50 mL of 1 M \(\mathrm{H_3PO_3}\) solution and 100 mL of 2 M \(\mathrm{H_3PO_2}\) solution, respectively, are :

The characteristics of elements X, Y and Z with atomic numbers, respectively, 33, 53 and 83 are :

\(\mathrm{FeX_2}\) and \(\mathrm{FeY_3}\) are known when x and y are :

The secondary structure of protein is stabilised by:

Match List - I with List - II :

	List - I Test/Reagents/Observation(s)		List - II Species detected
(a)	Lassaigne's Test	(i)	Carbon
(b)	Cu(II) oxide	(ii)	Sulphur
(c)	Silver nitrate	(iii)	N, S, P, and halogen
(d)	The sodium fusion extract gives black precipitate with acetic acid and lead acetate	(iv)	Halogen Specifically

The correct match is :

The structure of X is :

An unsaturated hydrocarbon X on ozonolysis gives A. Compound A when warmed with ammonical silver nitrate forms a bright silver mirror along the sides of the test tube. The unsaturated hydrocarbon X is :

Match List - I with List - II :

	List-I (Drug)		List-II (Class of Drug)
(a)	Furacin	(i)	Antibiotic
(b)	Arsphenamine	(ii)	Tranquilizers
(c)	Dimetone	(iii)	Antiseptic
(d)	Valium	(iv)	Synthetic antihistamines

Choose the most appropriate match :

Consider the above reaction and identify the Product P :

The major product formed in the following reaction is :

\(2\mathrm{NO(g)} + \mathrm{Cl_2(g)} \rightleftharpoons 2\mathrm{NOCl(s)}\)
This reaction was studied at \(-10^\circ\) and the following data was obtained

Run	\([\mathrm{NO}]_0\)	\([\mathrm{Cl_2}]_0\)	\(r_0\)
1	0.10	0.10	0.18
2	0.10	0.20	0.35
3	0.20	0.20	1.40

\([\mathrm{NO}]_0\) and \([\mathrm{Cl_2}]_0\) are the initial concentrations and \(r_0\) is the initial reaction rate.
The overall order of the reaction is __________. (Round off to the Nearest Integer).

The major components of German Silver are :