List of top Chemistry Questions asked in JEE Main

An ideal gas, \(\overline{C_V} = \frac{5}{2} R\), is expanded adiabatically against a constant pressure of 1 atm until it doubles in volume.
If the initial temperature and pressure are \(298 \, \text{K}\) and \(5 \, \text{atm}\), respectively, then the final temperature is ______ \( \, \text{K} \) (nearest integer).
Given: \(\overline{C_V}\) is the molar heat capacity at constant volume.

A solution of \( \text{H}_2\text{SO}_4 \) is 31.4% \( \text{H}_2\text{SO}_4 \) by mass and has a density of \( 1.25 \, \text{g/mL} \). The molarity of the \( \text{H}_2\text{SO}_4 \) solution is _____ M (nearest integer).
[Given molar mass of \( \text{H}_2\text{SO}_4 = 98 \, \text{g/mol} \)]

Number of carbocation from the following that are not stabilized by hyperconjugation is _________ .

IUPAC name of following hydrocarbon (X) is :

A sample of \( \text{CaCO}_3 \) and \( \text{MgCO}_3 \) weighed 2.21 g is ignited to constant weight of 1.152 g. The composition of the mixture is:
(Given molar mass in g mol\(^{-1}\))

The mass of silver (Molar mass of Ag : 108 gmol^–1 ) displaced by a quantity of electricity which displaces 5600 mL of O₂ at S.T.P. will be _____ g.

Consider the figure provided. 1 mol of an ideal gas is kept in a cylinder, fitted with a piston, at the position A, at \(18^\circ \text{C}\). If the piston is moved to position B, keeping the temperature unchanged, then 'x' \(\text{L atm}\) work is done in this reversible process. \(x =\) ______ \(\text{L atm}\). (nearest integer)
\([ \text{Given: Absolute temperature} = ^\circ \text{C} + 273.15, \, R = 0.08206 \, \text{L atm mol}^{-1} \text{K}^{-1} ]\)

Ail organic compound has 42.1% carbon, 6.4% hydrogen and remainder is oxygen. If its molecular weight is 342, then its molecular formula is :

Consider the oxides of group 14 elements \(SiO_2​,GeO_2​,SnO_2​,PbO_2​,CO\) and \(GeO\). The amphoteric oxides are

Which of the following is the correct structure for the given IUPAC name?
3-Methylpent-2-enal

Molality of an aqueous solution of urea is 4.44 m. Mole fraction of urea in solution is x × 10^–3. Value of x is _______. (integer answer)

A hypothetical electromagnetic wave is show below.

The frequency of the wave is x × 10¹⁹ Hz. x = ______ (nearest integer)

In qualitative test for identification of presence of phosphorous, the compound is heated with an oxidising agent. Which is further treated with nitric acid and ammonium molybdate respectively. The yellow coloured precipitate obtained is :

$\text{The number of non-polar molecules from the following is \_\_\_\_\_\_.} \\ \text{HF, H}_2\text{O, SO}_2, \, \text{H}_2, \, \text{CO}_2, \, \text{CH}_4, \, \text{NH}_3, \, \text{HCl, CHCl}_3, \, \text{BF}_3$

Match List I with List II

LIST-I	LIST-II
A. K2[Ni(CN)4]	I. sp3
B. [Ni(CO)4]	II. sp3d2
C. [Co(NH3)6]Cl3	III. dsp2
D. Na3[CoF6]	IV. d2sp3

Choose the correct answer from the options given below:

The major products from the following reaction sequence are product A and product B.

The total sum of \(\pi\) electrons in product A and product B are ______ (nearest integer)

Number of compounds which give reaction with Hinsberg's reagent is_______.

Cyclohexene is _________ type of an organic compound.

The number of optical isomers in following compound is : _____.

The solution from the following with highest depression in freezing point/lowest freezing point is

One Faraday of electricity liberates \(x×10^{−1 }\)gram atom of copper from copper sulphate, x is ______.

The molarity of 1 L orthophosphoric acid (\( H_3PO_4 \)) having 70% purity by weight (specific gravity \( 1.54 \, \text{g cm}^{-3} \)) is ______ M.
(Molar mass of \( H_3PO_4 = 98 \, \text{g mol}^{-1} \))

According to IUPAC system, the compound