List of top Chemistry Questions asked in JEE Main

The ionic radii of $K^+$, $Na^+$, $Al^{3+}$ and $Mg^{2+}$ are in the order :

What is the final product (major) 'A' in the given reaction ? $CH_3 - CH = CH - CH_3 \xrightarrow{HCl} A$

Which of the following are isostructural pairs ? (Note: Based on typical JEE pairs like $SO_4^{2-}$ and $BF_4^-$ or $NH_3$ and $PH_3$)

Given below are two statements:
Statement I : Aniline is less basic than acetamide.
Statement II : In aniline, the lone pair of electrons on nitrogen atom is delocalised over benzene ring due to resonance and hence less available to a proton.
Choose the most appropriate option :

Chalcogen group elements are :

The oxide that gives H$_2$O$_2$ most readily on treatment with H$_2$O is :

Match List - I with List - II :
\[ \begin{array}{llcl} & \text{List - I} & & \text{List - II} \\ \text{(Parameter)} & & \text{(Unit)} \\ (a) & \text{Cell constant} & (i) & \text{S cm}^2 \text{ mol}^{-1} \\ (b) & \text{Molar conductivity} & (ii) & \text{Dimensionless} \\ (c) & \text{Conductivity} & (iii) & \text{m}^{-1} \\ (d) & \text{Degree of dissociation of electrolyte} & (iv) & \Omega^{-1} \text{m}^{-1} \\ \end{array} \]
Choose the most appropriate answer from the options given below :

In the reaction of hypobromite with amide, the carbonyl carbon is lost as :

At 298.2 K the relationship between enthalpy of bond dissociation (in kJ mol$^{-1}$) for hydrogen ($E_H$) and its isotope, deuterium ($E_D$), is best described by :

Given below are two statements :
Statement I : Penicillin is a bacteriostatic type antibiotic.
Statement II : The general structure of Penicillin is :
Choose the correct option :

The correct sequence of correct reagents for the following transformation is :

The major products A and B formed in the following reaction sequence are :

The number of non-ionisable hydrogen atoms present in the final product obtained from the hydrolysis of PCl$_5$ is :

Select the correct statements.
(A) Crystalline solids have long range order.
(B) Crystalline solids are isotropic.
(C) Amorphous solids are sometimes called pseudo solids.
(D) Amorphous solids soften over a range of temperatures.
(E) Amorphous solids have a definite heat of fusion.
Choose the most appropriate answer from the options given below :

Which one of the following compounds will liberate $CO_2$ when treated with $NaHCO_3$?

The correct sequence of reagents used in the preparation of 4-bromo-2-nitroethylbenzene from benzene is:

Given below are two statements:
Statement I: $\alpha$ and $\beta$ forms of sulphur can change reversibly between themselves with slow heating or slow cooling.
Statement II: At room temperature the stable crystalline form of sulphur is monoclinic sulphur.

Match List - I with List - II : List - I (Class of Drug)
(a) Antacid
(b) Artificial Sweetener
(c) Antifertility
(d) Tranquilizers List - II (Example)
(i) Novestrol
(ii) Cimetidine
(iii) Valium
(iv) Alitame

In the leaching of alumina from bauxite, the ore expected to leach out in the process by reacting with NaOH is :

Consider the above reaction, and choose the correct statement :

Which one of the following lanthanides exhibits +2 oxidation state with diamagnetic nature ? (Given Z for Nd=60, Yb=70, La=57, Ce=58)

Which one of the following correctly represents the order of stability of oxides, $ X_2O $; (X = halogen) ?

Which one of the following complexes is violet in colour ?

Which one of the following is the correct PV vs P plot at constant temperature for an ideal gas ? (P and V stand for pressure and volume of the gas respectively)

The water soluble protein is :