List of top Chemistry Questions asked in JEE Main

After understanding the assertion and reason, choose the correct option.
Assertion: In the bonding molecular orbital (MO) of \(\mathrm{H_2}\), electron density is increased between the nuclei.
Reason: The bonding MO is \(\psi_A + \psi_B\), which shows destructive interference of the combining electron waves.

From the following statements regarding \(\mathrm{H_2O_2}\), choose the incorrect statement :

Higher order (>3) reactions are rare due to

The synthesis of alkyl fluorides is best accomplished by:

In the following sequence of reactions:
Toluene \(\xrightarrow{\mathrm{KMnO_4}}\) A \(\xrightarrow{\mathrm{SOCl_2}}\) B \(\xrightarrow{\mathrm{H_2/Pd\text{-}BaSO_4}}\) C,
The product C is

The colour of \(\mathrm{KMnO_4}\) is due to :

In the reaction

The product \(E\) is :

Which of the following compounds will exhibit geometrical isomerism?

Match the catalysts to the correct processes :

	Catalyst		Process
(A)	\(\mathrm{TiCl_3}\)	(i)	Wacker process
(B)	\(\mathrm{PdCl_2}\)	(ii)	Ziegler - Natta polymerization
(C)	\(\mathrm{CuCl_2}\)	(iii)	Contact process
(D)	\(\mathrm{V_2O_5}\)	(iv)	Deacon's process

The vapour pressure of acetone at 20\(^\circ\)C is 185 torr. When 1.2 g of a non-volatile substance was dissolved in 100 g of acetone at 20\(^\circ\)C, its vapour pressure was 183 torr. The molar mass (g mol\(^{-1}\)) of the substance is:

Which polymer is used in the manufacture of paints and lacquers?

Which among the following is the most reactive?

Which one of the following alkaline earth metal sulphates has its hydration enthalpy greater than its lattice enthalpy?

Nitrogen and Oxygen are the main components in the atmosphere but these do not react to form oxides of nitrogen. The reaction between nitrogen and oxygen requires high temperature.

In the long form of the periodic table, the valence shell electronic configuration of $5s^2 5p^4$ corresponds to the element present in :

Which of the vitamins given below is water soluble?

Chlorine water on standing loses its colour and forms :

Gaseous $N_2O_4$ dissociates into gaseous $NO_2$ according to the reaction $N _{2} O _{4}( g ) \rightleftharpoons 2 NO _{2}( g )$ At $300\, K$ and $1\, atm$ pressure, the degree of dissociation of $N_2O_4$ is $0.2.$ If one mole of $N_2O_4$ gas is contained in a vessel, then the density of the equilibrium mixture is :

A sample of a hydrate of barium chloride weighing $61\, g$ was heated until all the water of hydration is removed. The dried sample weighed $52\, g.$ The formula of the hydrated salt is : (atomic mass, $Ba = 137\, amu. Cl = 35.5\, amu$)

Calamine is an ore of :

Which artificial sweetener contains chlorine ?

Which of the following compounds is not colored yellow?

In Carius method of estimation of halogens $250\, mg$ of an organic compound gave $141\, mg$ of $AgBr$. The percentage of bromine in the compound is (atomic mass $Ag\, =\, 108, Br \,= \,80$)

The intermolecular interaction that is dependent on the inverse cube of distance between the molecules is

The least number of oxyacids are formed by :