List of top Chemistry Questions asked in JEE Main

A weak acid HA has degree of dissociation x. Which option gives the correct expression of \(pH - pK_a\)?
In the reaction \( 2A + B \rightarrow C \), if the rate law is \( \text{Rate} = k[A]^2[B] \), what is the overall order of the reaction?
The compounds that produce CO$_2$ with aqueous NaHCO$_3$ solution are:
The compounds that produce CO2 with aqueous NaHCO3 solution are:
Find the dimensions of \( \frac{B}{\mu_0} \)
Match the LIST-I with LIST-II (Redox Reactions).
Redox Reaction;type of Redox Reaction
Choose the correct answer from the options given below:
Ice and water are placed in a closed container at a pressure of 1 atm and temperature 273.15K. If pressure of the system is increased 2 times, keeping temperature constant, then identify correct observation from the following:
What is the hybridization of the central atom in the molecule \( \text{SO}_3 \)?
Consider the following elements In, Tl, Al, Pb, and Ge. The most stable oxidation states of elements with highest and lowest first ionisation enthalpies, respectively, are:
The metal ion whose electronic configuration is not affected by the nature of the ligand and which gives a violet color in non-luminous flame under hot condition in borax bead test is:
Which of the following oxidation reactions are carried out by both \( K_2Cr_2O_7 \) and \( KMnO_4 \) in acidic medium?
A. \( I^- \rightarrow I_2 \)
B. \( S^{2-} \rightarrow S \)
C. \( Fe^{2+} \rightarrow Fe^{3+} \)
D. \( I^- \rightarrow IO_3^- \)
E. \( S_2O_3^{2-} \rightarrow SO_4^{2-} \)
Choose the correct answer from the options given below:

Given below are two statements: 

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


 

Which of the following mixing of 1M base and 1M acid leads to the largest increase in temperature?
When Ethane-1,2-diamine is added progressively to an aqueous solution of Nickel (II) chloride, the sequence of colour change observed will be:

In the given structure, number of \( sp \) and \( sp^2 \) hybridized carbon atoms present respectively are: 

The elemental composition of a compound is 54.2%C, 9.2%H, and 36.6%O. If the molar mass of the compound is 132 g/mol, the molecular formula of the compound is:
Consider the following sequence of reactions: 
i) \( \text{Mg}, \text{dry ether} \)  
ii) \( \text{CO}_2, \text{H}_2\text{O}^+ \) 
iii) \( \text{NH}_3, \Delta \) 
11.25 mg of chlorobenzene will produce \( x \times 10^{-1} \) mg of product B. Given molar mass of C, H, O, N, and Cl as 12, 1, 16, 14, and 35.5 g mol\(^{-1}\), respectively, the value of \( x \) is:
Quantitative analysis of an organic compound (X) shows the following percentage composition. C: 14.5% Cl: 64.46% H: 1.8% Empirical formula mass of the compound (X) is:
For hydrogen atom, the orbital/s with lowest energy is/are:
Based on the data given below: \[ E^\circ_{\text{Cr}_2\text{O}_7^{2-}/\text{Cr}^{3+}} = 1.33 \, \text{V}, \quad E^\circ_{\text{Cl}_2/\text{Cl}^-} = 1.36 \, \text{V}, \quad E^\circ_{\text{MnO}_4^-/\text{Mn}^{2+}} = 1.51 \, \text{V}, \quad E^\circ_{\text{Cr}^{3+}/\text{Cr}} = -0.74 \, \text{V}. \] The strongest reducing agent is:

For the reaction, \[ H_2(g) + I_2(g) \rightleftharpoons 2HI(g) \] Attainment of equilibrium is predicted correctly by:

Match List - I with List - II:

List - I

List - II

(A) Adenine

(I)

(B) Cytosine

(II)

(C) Thymine

(III)

(D) Uracil

(IV)

 

Choose the correct answer from the options given below:

The molarity of a 70%(mass/mass) aqueous solution of a monobasic acid (X) is:
For a given reaction \( R \rightarrow P \), \( t_{1/2} \) is related to \([A_0]\) as given in the table. Given: \( \log 2 = 0.30 \). Which of the following is true? 
\([A]\) (mol/L)\(t_{1/2}\) (min)
0.100200
0.025100
The heat of formation of \( \text{SO}_2(g) \) is given by: \[ S(g) + \frac{3}{2} O_2(g) \rightarrow SO_3(g) + 2x \, \text{kcal} \] \[ SO_2(g) + \frac{1}{2} O_2(g) \rightarrow SO_3(g) + y \, \text{kcal} \]