List of top Chemistry Questions asked in JEE Main

The gas liberated by the electrolysis of Dipotassium succinate solution is:
In some solutions, the concentration of \(\mathrm{H_3O^+}\) remains constant even when small amounts of strong acid or strong base are added to them. These solutions are known as:
The molar heat capacity (\(\mathrm{C_p}\)) of \(\mathrm{CD_2O}\) is 10 cals at 1000 K. The change in entropy associated with cooling 32 g of \(\mathrm{CD_2O}\) vapour from 1000 K to 100 K at constant pressure will be: (D = deuterium, atomic mass = 2u)
In allene (\(\mathrm{C_3H_4}\)), the type(s) of hybridization of the carbon atoms is (are) :
A gaseous compound of nitrogen and hydrogen contains 12.5% (by mass) of hydrogen. The density of the compound relative to hydrogen is 16. The molecular formula of the compound is:
Consider the following equilibrium
\(\mathrm{AgCl}\downarrow + 2\mathrm{NH_3} \rightleftharpoons [\mathrm{Ag(NH_3)_2}]^+ + \mathrm{Cl^-}\)
White precipitate of AgCl appears on adding which of the following?
Which one of the following does not have a pyramidal shape?
Structure of some important polymers are given. Which one represents Buna-S ?
Which one of the following class of compounds is obtained by polymerization of acetylene ?
The major product of the reaction is
Which one of the following reactions will not result in the formation of carbon-carbon bond ?
An octahedral complex of \(\mathrm{Co^{3+}}\) is diamagnetic. The hybridisation involved in the formation of the complex is :
In a nucleophilic substitution reaction : \(\mathrm{R-Br + Cl^-} \xrightarrow{\mathrm{DMF}} \mathrm{R-Cl + Br^-}\), which one of the following undergoes complete inversion of configuration ?
In the hydroboration - oxidation reaction of propene with diborane, \(\mathrm{H_2O_2}\) and NaOH, the organic compound formed is:
Which is the major product formed when acetone is heated with iodine and potassium hydroxide?
Allyl phenyl ether can be prepared by heating :
The correct statement about the magnetic properties of \([\mathrm{Fe(CN)_6}]^{3-}\) and \([\mathrm{FeF_6}]^{3-}\) is : (Z = 26).
A compound of vanadium chloride has spin only magnetic moment of 1.73 BM. Its formula is
The gas evolved on heating \(\mathrm{CaF_2}\) and \(\mathrm{SiO_2}\) with concentrated \(\mathrm{H_2SO_4}\), on hydrolysis gives a white gelatinous precipitate. The precipitate is:
The form of iron obtained from blast furnace is :
Which of the following is not formed when \(\mathrm{H_2S}\) reacts with acidic \(\mathrm{K_2Cr_2O_7}\) solution ?
In which of the following pairs A is more stable than B?
The half-life period of a first-order reaction is 15 minutes. The amount of substance left after one hour will be
The standard enthalpy of formation of \(\mathrm{NH_3}\) is \(-46.0\ \mathrm{kJ/mol}\). If bond enthalpy of \(\mathrm{H_2}\) is \(-436\ \mathrm{kJ/mol}\) and that of \(\mathrm{N_2}\) is \(-712\ \mathrm{kJ/mol}\), the average bond enthalpy of \(\mathrm{N-H}\) bond in \(\mathrm{NH_3}\) is :
A current of 10.0 A flows for 2.00 h through an electrolytic cell containing a molten salt of metal X. This results in the decomposition of 0.250 mol of metal X at the cathode. The oxidation state of X in the molten salt is :
(F = 96,500 C)