List of top Chemistry Questions asked in JEE Main

For the reaction, \[ H_2(g) + I_2(g) \rightleftharpoons 2HI(g) \]

Attainment of equilibrium is predicted correctly by: 


 
 

500 J of energy is transferred as heat to 0.5 mol of Argon gas at 298 K and 1.00 atm. The final temperature and the change in internal energy respectively are: Given \( R = 8.3 \, {J K}^{-1} \, {mol}^{-1} \) Choose the correct answer from the options given below:

Identify correct statement/s: 
(A) \( -\text{OCH}_3 \) and \( -\text{NHCOCH}_3 \) are activating groups. 
(B) \( -\text{CN} \) and \( -\text{OH} \) are meta directing groups. 
(C) \( -\text{CN} \) and \( -\text{SO}_3\text{H} \) are meta directing groups. 
(D) Activating groups act as ortho- and para-directing groups. 
(E) Halides are activating groups. 

Choose the correct answer from the options given below:

The structure of the major product formed in the following reaction is: 

Find the compound \( A \) from the following reaction sequences: \[ A \xrightarrow{\text{aqua regia}} B \xrightarrow{(1) \, \text{KNO}_3, \, \text{NH}_4\text{OH}} \text{yellow ppt}. \]
For hydrogen atom, the orbital/s with lowest energy is/are:
The correct option with order of melting points of the pairs (Mn, Fe), (Tc, Ru) and (Re, Os) is:
Match List - I with List - II: List - I: (A) Amylase
(B) Cellulose
(C) Glycogen
(D) Amylopectin
List - II: (I) \( \beta \)-C1-C4 plant
(II) \( \alpha \)-C1-C4 animal
(III) \( \alpha \)-C1-C4 \( \alpha \)-C1-C6 plant
(IV) \( \alpha \)-C1-C4 plant
Choose the correct answer from the options given below:

Match List-I with List-II:

How many different stereoisomers are possible for the given molecule?
How many different stereoisomers are possible for the given molecule?
 

From the magnetic behaviour of \([NiCl_4]^{2-}\) (paramagnetic) and [Ni\((CO)_4\)] (diamagnetic), choose the correct geometry and oxidation state.

The IUPAC name of the following compound is:

Which of the following acids is a vitamin?
A vessel at 1000 K contains \( \text{CO}_2 \) with a pressure of 0.5 atm. Some of \( \text{CO}_2 \) is converted into \( \text{CO} \) on addition of graphite. If total pressure at equilibrium is 0.8 atm, then \( K_p \) is:
Which of the following statement is not true for radioactive decay?
Given below are two statements: Statement I: One mole of propyne reacts with excess of sodium to liberate half a mole of H₂ gas. Statement II: Four g of propyne reacts with NaNH₂ to liberate NH₃ gas which occupies 224 mL at STP. In the light of the above statements, choose the most appropriate answer from the options given below:

The compounds which give positive Fehling's test are:
The compounds which give positive Fehling's test are:
Choose the CORRECT answer from the options given below:

The number of molecules/ions that show linear geometry among the following is _____. SO₂, BeCl₂, CO₂, N₃⁻, NO₂, F₂O, XeF₂, NO₂⁺, I₃⁻, O₃

Electrolysis of 600 mL aqueous solution of NaCl for 5 min changes the pH of the solution to 12. The current in Amperes used for the given electrolysis is ________________________. (Nearest integer).
A liquid when kept inside a thermally insulated closed vessel at \(25^{\circ}C\) was mechanically stirred from outside. What will be the correct option for the following thermodynamic parameters?
Radius of the first excited state of Helium ion is given as:
\(a_0\) = radius of first stationary state of hydrogen atom.
Some CO\(_2\) gas was kept in a sealed container at a pressure of 1 atm and at 273 K. This entire amount of CO\(_2\) gas was later passed through an aqueous solution of Ca(OH)\(_2\). The excess unreacted Ca(OH)\(_2\) was later neutralized with 0.1 M of 40 mL HCl. If the volume of the sealed container of CO\(_2\) was \(x\), then \(x\) is ________________________ cm\(^3\) (nearest integer). [Given: The entire amount of CO\(_2\) reacted with exactly half the initial amount of Ca(OH)\(_2\) present in the aqueous solution.]
Which of the following electronegativity order is incorrect?
Which of the following electrolyte can be used to obtain \( \text{H}_2\text{S}_2\text{O}_8 \) by the process of electrolysis?
In which of the following complexes the CFSE, \(\Delta_0\) will be equal to zero?