List of top Chemistry Questions asked in JEE Main

The group of molecules having identical shape is :

A reaction at 1 bar is non-spontaneous at low temperature but becomes spontaneous at high temperature. Identify the correct statement about the reaction among the following :

For the reaction, A(g) + B(g) \(\rightarrow\) C(g) + D(g), \(\Delta H^\circ\) and \(\Delta S^\circ\) are, respectively, \(-29.8\ \mathrm{kJ\ mol^{-1}}\) and \(-0.100\ \mathrm{kJ\ K^{-1}\ mol^{-1}}\) at 298 K. The equilibrium constant for the reaction at 298 K is :

Which intermolecular force is most responsible in allowing xenon gas to liquefy ?

The reaction of ozone with oxygen atoms in the presence of chlorine atoms can occur by a two step process shown below :
\(\mathrm{O_3(g)+Cl^{\bullet}(g)\rightarrow O_2(g)+ClO^{\bullet}(g)}\) ____ (i)
\(k_i=5.2\times10^{9}\ \mathrm{L\ mol^{-1}\ s^{-1}}\)
\(\mathrm{ClO^{\bullet}(g)+O^{\bullet}(g)\rightarrow O_2(g)+Cl^{\bullet}(g)}\) ____ (ii)
\(k_{ii}=2.6\times10^{10}\ \mathrm{L\ mol^{-1}\ s^{-1}}\)
The closest rate constant for the overall reaction \(\mathrm{O_3(g)+O^{\bullet}(g)\rightarrow 2\,O_2(g)}\) is :

The non-metal that does not exhibit positive oxidation state is :

What will occur if a block of copper metal is dropped into a beaker containing a solution of 1M \(\mathrm{ZnSO_4}\) ?

Which of the following statements about low density polythene is FALSE ?

The pair in which phosphorous atoms have a formal oxidation state of +3 is :

For a linear plot of \(\log(x/m)\) versus \(\log p\) in a Freundlich adsorption isotherm, which of the following statements is correct ? (k and n are constants)

Which one of the following complexes shows optical isomerism?
(en = ethylenediamine)

The pair having the same magnetic moment is :
[At. No.: Cr = 24, Mn = 25, Fe = 26, Co = 27]

The hottest region of Bunsen flame shown in the figure below is :

In the Hofmann bromamide degradation reaction, the number of moles of NaOH and \(\mathrm{Br_2}\) used per mole of amine produced are:

Which of the following atoms has the highest first ionization energy?

Thiol group is present in :

2-chloro-2-methylpentane on reaction with sodium methoxide in methanol yields:

The product of the reaction given below is :

The absolute configuration of

is :

The reaction of propene with HOCl (\(\mathrm{Cl_2 + H_2O}\)) proceeds through the intermediate:

18 g glucose (\(\mathrm{C_6H_{12}O_6}\)) is added to 178.2 g water. The vapor pressure of water (in torr) for this aqueous solution is :

The equilibrium constant at 298 K for a reaction \(\mathrm{A + B \rightleftharpoons C + D}\) is 100. If the initial concentration of all the four species were 1 M each, then equilibrium concentration of D (in \(\mathrm{mol\ L^{-1}}\)) will be:

Which one of the following statements about water is FALSE ?

Extraction of copper by smelting uses silica as an additive to remove :

An aqueous solution of a salt $MX_2$ at certain temperature has a van?t Hoff factor of 2. The degree of dissociation for this solution of the salt is :