List of top Chemistry Questions asked in JEE Main

Consider the $bcc$ unit cells of the solids $1$ and $2$ with the position of atoms as shown below. The radius of atom $B$ is twice that of atom $A$. The unit cell edge length is $50\%$ more in solid $2$ than in $1$. What is the approximate packing efficiency in solid $2$ ?

Which is wrong with respect to our responsibility as a human being to protect our environment ?

The peptide that gives positive ceric ammonium nitrate and carbylamine tests is :

The correct order of the first ionization enthalpies is:

Amylopectin is composed of :

The ratio of number of atoms present in a simple cubic, body centered cubic and face centered cubic structure are, respectively :

The pH of a 0.02M $NH_4Cl$ solution will be [given $K_b(NH_4OH) = 10^{-5}$ and log2=0.301]

When the first electron gain enthalpy $( \Delta_{eg}H) $ of oxygen is $-141\, kJ/mol$, its second electron gain enthalpy is :

A solution of sodium sulfate contains $92\, g$ of ${Na^{+}}$ ions per kilogram of water. The molality of ${Na^{+}}$ ions in that solution in ${mol \; kg^{-1}}$ is:

The correct statement regarding the given Ellingham diagram is:

The ore that contains both iron and copper is:

For emission line of atomic hydrogen from $n_i = 8$ to $n_f $ = the plot of wave number $(\bar{v})$ against $( \frac{1}{n^2})$ will be (The Ry dberg constant, $R_H$ is in wave number unit).

The metal that gives hydrogen gas upon treatment with both acid as well as base is :

The basic structural unit of feldspar, zeolites, mica, and asbestos is :

The increasing order of the \(\mathrm{pK_b}\) of the following compound is :

In the following reaction; \(\mathrm{xA \to yB}\)
\(\log_{10}\left[-\frac{d[A]}{dt}\right] = \log_{10}\left[\frac{d[B]}{dt}\right] + 0.3010\)
'A' and 'B' respectively can be :

Given
\(\mathrm{Co^{3+} + e^- \to Co^{2+}}\) ; \(\mathrm{E^o}\) = + 1.81 V
\(\mathrm{Pb^{4+} + 2e^- \to Pb^{2+}}\) ; \(\mathrm{E^o}\) = + 1.67 V
\(\mathrm{Ce^{4+} + e^- \to Ce^{3+}}\) ; \(\mathrm{E^o}\) = + 1.61 V
\(\mathrm{Bi^{3+} + 3e^- \to Bi}\) ; \(\mathrm{E^o}\) = + 0.20 V
Oxidizing power of the species will increase in the order :

The major products of the following reaction are :

(1) \(\mathrm{CHCl_3}\)/aq. NaOH
(2) HCHO, NaOH (conc)
(3) \(\mathrm{H_3O^+}\)

The complex ion that will lose its crystal field stabilization energy upon oxidation of its metal to +3 state is :
(Phen =

and Ignore pairing energy)

Complete removal of both the axial ligands (along the z-axis) from an octahedral complex leads to which of the following splitting patterns? (relative orbital energies not on scale).

The electrons are more likely to be found :

An example of a disproportionation reaction is :

An ideal gas is allowed to expand form 1 L to 10 L against a constant external pressure of 1 bar. The work done in kJ is :

The group number, number of valence electrons, and valency of an element with atomic number 15, respectively, are:

The major product of the following addition reaction is :
\(\mathrm{H_3C{-}CH{=}CH_2 \xrightarrow{Cl_2/H_2O}}\)