List of top Chemistry Questions asked in JEE Main

Tyndall effect is more effectively shown by:
In polythionic acid, H\(_2\)S\(_x\)O\(_6\) (x = 3 to 5) the oxidation state(s) of sulphur is/are :
Deuterium resembles hydrogen in properties but :
In which one of the following molecules strongest back donation of an electron pair from halide to boron is expected?
Which refining process is generally used in the purification of low melting metals ?
The unit of the van der Waals gas equation parameter 'a' in \(\left(P + \frac{an^2}{V^2}\right)(V - nb) = nRT\) is:

The major product formed in the following reaction is : 

The correct options for the products A and B of the following reactions are : 

Among the following compounds I-IV, which one forms a yellow precipitate on reacting sequentially with (i) NaOH (ii) dil. $HNO_3$ (iii) $AgNO_3$? 

The major product formed in the following reaction is : 

Excess of isobutane on reaction with $Br_2$ in presence of light at $125^\circ C$ gives which one of the following, as the major product ? 

The \(OH^-\) concentration in a mixture of 5.0 mL of 0.0504 M \(NH_4Cl\) and 2 mL of 0.0210 M \(NH_3\) solution is \(x \times 10^{-6}\) M. The value of \(x\) is _________. (Nearest integer)
[Given \(K_w = 1 \times 10^{-14}\) and \(K_b = 1.8 \times 10^{-5}\)]
The number of 4f electrons in the ground state electronic configuration of \(Gd^{2+}\) is _________. [Atomic number of Gd = 64] (Integer answer)
Given below are two statements :
Statement I : In the titration between strong acid and weak base methyl orange is suitable as an indicator.
Statement II : For titration of acetic acid with NaOH phenolphthalein is not a suitable indicator.
In the light of the above statements, choose the most appropriate answer from the options given below :
The polymer formed on heating Novolac with formaldehyde is :
The conversion of hydroxyapatite occurs due to presence of \(F^-\) ions in water. The correct formula of hydroxyapatite is :
Which one of the following when dissolved in water gives coloured solution in nitrogen atmosphere ?
Which one of the following is correct for the adsorption of a gas at a given temperature on a solid surface ?
Which one of the following methods is most suitable for preparing deionized water ?
The incorrect statement is :
What are the products formed in sequence when excess of \(CO_2\) is passed in slaked lime ?
Given below are two statements.
Statement I : The choice of reducing agents for metals extraction can be made by using Ellingham diagram, a plot of \(\Delta G\) vs temperature.
Statement II : The value of \(\Delta S\) increases from left to right in Ellingham diagram.
In the light of the above statements, choose the most appropriate answer from the options given below :

The class of drug to which chlordiazepoxide with above structure belongs is : 

 

Consider the given reaction, the Product A is: 

 

Which one of the following compounds is not aromatic ?