List of top Chemistry Questions asked in JEE Main

The correct order in aqueous medium of basic strength in case of methyl substituted amines is :

The correct sequence of reagents for the preparation of Q and R is:
The correct sequence of reagents for the preparation of Q and R is:

The radius of the $2^{\text {nd }}$ orbit of $Li ^{2+}$ is $x$. The expected radius of the $3^{\text {rd }}$ orbit of $Be ^{3+}$ is

A cubic solid is made up of two elements $X$ and $Y$ Atoms of $X$ are present on every alternate corner and one at the enter of cube $Y$ is at $\frac{1}{3} td$ of the total faces The empirical formula of the compound is

The variation of the rate of an enzyme catalyzed reaction with substrate concentration is correctly represented by graph
Find out the oxidation number of the central metal atom of fe(CO)5 , VO2+, and WO3. Then calculate the sum of their oxidation state.
What is the ratio of σ and pi bonds in pyrophosphoric acid ?
Coagulating value of the electrolytes AlCl3 and NaCl for As2S3 are 0.09 and 50.04 respectively. The coagulating power of AlCl3 is x times the coagulating power of NaCl. The value of x is ______ .
The number of incorrect statements from the following is _____
A. The electrical work that a reaction can perform at constant pressure and temperature is equal to the reaction Gibbs energy.
B. E°cell is dependent on the pressure.
C. dEθ cell/dT = ΔrSθ/nF
D. A cell is operating reversibly if the cell potential is exactly balanced by an opposing source of potential difference.
If the boiling points of two solvents X and Y (having same molecular weights) are in the ratio 2:1 and their enthalpy of vaporizations are in the ratio 1:2, then the boiling point elevation constant of X is m times the boiling point elevation constant of Y. The value of m is ______ (nearest integer).
For complete combustion of ethene,
\(C_2H_4(g) + 3O_2(g) \longrightarrow 2CO_2(g) + 2H_2O (l)\)
the amount of heat produced as measured in bomb calorimeter is 1406 kJ mol-1 at 300K. The minimum value of \(T\Delta S\) needed to reach equilibrium is (-) _____ . kJ.(Nearest integer)
Given: R = 8.3 J K-1 mol-1
The number of species from the following carrying a single lone pair on central atom Xenon is ______ .
XeF5+, XeO3, XeO2F2, XeF5-, XeO3F2, XeOF4, XeF4
Given below are two statements:
Statement I: In redox titration, the indicators used are sensitive to change in pH of the solution.
Statement II: In acid-base titration, the indicators used are sensitive to change in oxidation potential.
In the light of the above statements, choose the most appropriate answer from the options given below
Match List l with List ll.
List I Natural amino acid List II One letter code
(I) Glutamic acid (a) Q
(II) Glutamine (b) W
(III) Tyrosine (c) E
(IV) Tryptophan (d) Y
Choose the correct answer from the options given below:
The statement/s which are true about antagonists from the following is/are:
A. They bind to the receptor site.
B. Get transferred inside the cell for their action.
C. Inhibit the natural communication of the body.
D. Mimic the natural messenger.
Choose the correct answer from the options given below:
The product (P) formed from the following multistep reaction is:
The product (P) formed from the following multistep
At constant temperature, a gas is at a pressure of 940.3 mm Hg. The pressure at which its volume decreases by 40% is mm Hg. (Nearest integer)
The descending order of acidity for the following carboxylic acid is-
A. CH3COOH
B. F3C-COOH
C. CICH2-COOH
D. FCH2-COOH
E. BrCH2-COOH
Choose the correct answer from the options given below:
The correct order of reactivity of following haloarenes towards nucleophilic substitution with aqueous NaOH is 
order of reactivity of following haloarenes
Choose the correct answer from the options given below:
The correct IUPAC nomenclature for the following compound is.
2 Methyl 5 oxohexanoic acid
The number of bent-shaped molecule(s) from the following is_______? 
SO2, O3, I3-, N3-
The Sum of number of lone pairs in central atom in IF5 and IF7 is:
In the following reactions, the total number of oxygen atoms in X and Y is _______
Na2O + H2O → 2X
Cl2O7 + H2O → 2Y
Major product 'P' formed in the following reaction is:
Major product 'P' formed in the following reaction is:
Which of these reactions is not a part of breakdown of ozone in stratosphere?