List of top Chemistry Questions asked in JEE Main

In the reaction:$BC{l}_3+P{H}_3\rightleftharpoons C{l}_{3}B·P{H}_3$ Lewis base is:

Find out the work done in the following process.

Decreasing order of the field strength of the following ligands will be: CO, CN^-, Cl^-, H₂O

Bond dissociation energy of $XY,X_2$, and $Y_2$ (all diatomic molecules) are in the ratio of $1:1:0.5$ and $\mathrm{\Delta }{H}_f$ of $XY$ is $-100kJ{mol}^{-1}$. The bond dissociation energy of $X_2$ is $100x.$ The value of $x$ is

Which of the following statements is incorrect?

Consider the reaction between PbS and HNO₃.
PbS + HNO₃ →
Which of the following is not formed.

S-I: Sulphur exists as S8 while oxygen exists as O2.
S-II: In oxygen, pπ-pπ bonding occurs while it is not effective in sulphur.

Which among the following have a single unpaired electron?
N₂, 0₂, CN^-, O₂^-, C₂^2- , N^2-

Which of the following is colorless?

Consider the following compound.

Correct order of their basicity is:

Arrange the following in increasing order of acidity.

Which of the following orbitals has the highest energy?

Number of ambidentate nucleophiles among the following is:
CN^-, SCN^- NO₂^-, CH₃COO^-, C₂0₄^2-, NH₂^-, SO₄^2-

Equal volume of 1 M HCI and 1 M H2SO4 neutralized by dil. NaOH and heat released is x and y kcal respectively, then which is correct?

Chemical formula of compound present in tooth enamel?

Consider the following electronic configuration:
Cu²⁺ = [Ar] 3d⁴4s⁰
Cu⁺ = [Ar] 3d¹⁰4s⁰
Which option is correct?

Which of the following has sp² hybridisation?

For the reaction:

Product (P) is

Molecular orbital σ* represents:

How many carbon atoms are there in a molecule of tyrosine?

In the test for phosphorus using ammonium molybdate, yellow precipitate of compound (X) is obtained. What is the oxidation state of molybdenum in (X)?

S-I: Blood is a buffer solution, whose pH is maintained at 7.4 by an acidic buffer. 
S-II: pH is maintained by HCO₃^-  and   H₂CO₃

Assertion: Kjeldahl method is not used for pyridine.
Reason: Nitrogen of pyridine does not change to ammonium sulphate under these conditions.

Which of the following is correct?

Which of the following are aromatic compounds?