List of top Chemistry Questions asked in JEE Main

The Ksp for bismuth sulphide (Bi2S3) is 1.08 × 10–73. The solubility of Bi2S3 in mol L–1 at 298 K is
Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R.
Assertion A: Fluorine forms one oxoacid.
Reason R: Fluorine has smallest size amongst all halogens and is highly electronegative.
In the light of the above statements, choose the most appropriate answer from the option given below.
Manganese (VI) has ability to disproportionate in acidic solution. The difference in oxidation states of two ions it forms in acidic solution is _____.
White precipitate of \(AgCl\) dissolves in aqueous ammonia solution due to formation of:
The correct order of nucleophilicity is
\(250\) \(g\) solution of \(D-glucose\) in water contains 10.8% of carbon by weight. The molality of the solution is nearest to (Given: Atomic Weights are, \(H, 1 u; C, 12 u; O, 16 u\))
Oxidation of toluene to benzaldehyde can be easily carried out with which of the following reagents?
Which one of the following alkaline earth metal ions has the highest ionic mobility in its aqueous solution?
Low oxidation state of metals in their complexes are common when ligands :
Which of the following enhances the lathering property of soap?
An element M crystallises in a body centred cubic unit cell with a cell edge of 300 pm. The density of the element is 6.0 g cm–3. The number of atoms present in 180 g of the element is ______× 1023. (Nearest integer)

In which of the following pairs, electron gain enthalpies of constituent elements are nearly the same or identical ? 

(A) $Rb$ and $Cs$ 

(B) $Na$ and $K$ 

(C) $Ar$ and $Kr$ 

(D) $I $ and $At$ 

Choose the correct answer from the options given below :

When the excited electron of a H atom from n = 5 drops to the ground state, the maximum number of emission lines observed are ____.

While estimating the nitrogen present in an organic compound by Kjeldahl’s method, the ammonia evolved from 0.25 g of the compound neutralized 2.5 mL of 2 M H2SO4. The percentage of nitrogen present in organic compound is ________

In the above reaction product B is:
In the above reaction product B is:
Product B is
Among the following the number of curves not in accordance with Freundlich adsorption isotherm is____.
Number of curves
Among the following the number of state variables is____. 
Internal energy (U) 
Volume (V) 
Heat (q) 
Enthalpy (H)

For a reaction, given below is the graph of ln k vs 1/T. The activation energy for the reaction is equal to____ \(cal mol^{–1}\). (Nearest integer) 

(Given: \(R = 2 cal K^{-1} mol^{-1}\))

Graph In k vs T

Which of the following has least tendency toliberate $H_2$ from mineral acids?
A sample of 0.125 g of an organic compound when analysed by Duma’s method yields 22.78 mL of nitrogen gas collected over KOH solution at 280 K and 759 mm Hg. The percentage of nitrogen in the given organic compound is____.(Nearest integer) 
Given : 1. The vapour pressure of water of 280 K is 14.2 mm Hg. 
            2. R = 0.082 L atm K–1 mol–1
Which of the following relation is not correct?
Which of the following sets of quantum numbers is not allowed?
Which of the given reactions is not an example of disproportionation reaction?
Which of the reaction is suitable for concentrating ore by leaching process?

Which of the following statement is incorrect?