List of top Chemistry Questions asked in JEE Main

Among the following species the one which causes the highest CFSE, \(\Delta_0\) as a ligand is:

Which one of the following complexes will most likely absorb visible light? (At nos. Sc = 21, Ti = 22, V = 23, Zn = 30)

Which one of the following exhibits the large number of oxidation states?

The major product obtained in the photo catalysed bromination of 2-methylbutane is:

Global warming is due to increase of:

on mercuration-demercuration produces the major product:

Which of the following xenon-oxo compounds may not be obtained by hydrolysis of xenon fluorides?

The (\(\mathrm{S^\circ}\)) of the following substances are: \(\mathrm{CH_4}\)(g) \(186.2\,\mathrm{JK^{-1}mol^{-1}}\), \(\mathrm{O_2}\)(g) \(205.2\,\mathrm{JK^{-1}mol^{-1}}\), \(\mathrm{CO_2}\)(g) \(213.6\,\mathrm{JK^{-1}mol^{-1}}\), \(\mathrm{H_2O}\)(g) \(69.9\,\mathrm{JK^{-1}mol^{-1}}\). The entropy change (\(\Delta S^\circ\)) for the reaction \(\mathrm{CH_4(g)+2O_2(g)\to CO_2(g)+2H_2O(l)}\) is:

The standard enthalpy of formation (\(\Delta_f H^\circ_{298}\)) for methane, \(\mathrm{CH_4}\) is \(-74.9\,\mathrm{kJ\,mol^{-1}}\). In order to calculate the average energy given out in the formation of a C - H bond from this it is necessary to know which one of the following?

The de-Broglie wavelength of a particle of mass \(6.63\) g moving with a velocity of \(100\,\mathrm{ms^{-1}}\) is:

Which of the following molecules has two sigma (\(\sigma\)) and two pi (\(\pi\)) bonds?

Complete reduction of benzene-diazonium chloride with \(\mathrm{Zn/HCl}\) gives:

Which one of the following statements is not correct?

The following reaction is known as:

An organic compound A, \(\mathrm{C_5H_8O}\), reacts with \(\mathrm{H_2O}\), \(\mathrm{NH_3}\) and \(\mathrm{CH_3COOH}\) as described below:

A is:

Which one of the following is used as Antihistamine?

Chlorobenzene reacts with trichloroacetaldehyde (chloral) in the presence of \(\mathrm{H_2SO_4}\).

The major product formed is:

Which of the following name formula combinations is not correct?

Consider the coordination compound, \([\mathrm{Co(NH_3)_6}]\mathrm{Cl_3}\). In the formation of this complex, the species which acts as the Lewis acid is:

Shapes of certain interhalogen compounds are stated below. Which one of them is not correctly stated?

In the reaction of formation of sulphur trioxide by contact process \(2\mathrm{SO_2} + \mathrm{O_2} \rightleftharpoons 2\mathrm{SO_3}\) the rate of reaction was measured as \(\frac{d[\mathrm{O_2}]}{dt} = -2.5\times10^{-4}\ \mathrm{mol\,L^{-1}\,s^{-1}}\). The rate of reaction in terms of \([\mathrm{SO_2}]\) in \(\mathrm{mol\,L^{-1}\,s^{-1}}\) will be:

For the reaction, \(2\mathrm{N_2O_5} \rightarrow 4\mathrm{NO_2} + \mathrm{O_2}\), the rate equation can be expressed in two ways \(-\frac{d[\mathrm{N_2O_5}]}{dt} = k[\mathrm{N_2O_5}]^n\) and \(+\frac{d[\mathrm{NO_2}]}{dt} = k'[\mathrm{N_2O_5}]^n\). \(k\) and \(k'\) are related as:

Which of the following statements about the depletion of ozone layer is correct?

The reagent needed for converting

Given
\(\mathrm{Fe^{3+}(aq)} + e^- \rightarrow \mathrm{Fe^{2+}(aq)};\ E^0 = +0.77\ \mathrm{V}\)
\(\mathrm{Al^{3+}(aq)} + 3e^- \rightarrow \mathrm{Al(s)};\ E^0 = -1.66\ \mathrm{V}\)
\(\mathrm{Br_2(aq)} + 2e^- \rightarrow 2\mathrm{Br^-};\ E^0 = +1.09\ \mathrm{V}\)
Considering the electrode potentials, which of the following represents the correct order of reducing power?