List of top Chemistry Questions asked in JEE Main

Given below are two statements:
Statement I: The electronegativity of group 14 elements from Si to Pb gradually decreases.
Statement II: Group 14 contains non-metallic, metallic, as well as metalloid elements.
In the light of the above statements, choose the most appropriate from the options given below:
Given below are two statements:
Statement (I) : Fusion of MnO$_2$ with KOH and an oxidising agent gives dark green K$_2$MnO$_4$.
Statement (II) : Manganate ion on electrolytic oxidation in alkaline medium gives permanganate ion.
In the light of the above statements, choose the correct answer from the options given below.
Match List I with List II
match
Choose the correct answer from the options given below :
In which one of the following metal carbonyls, CO forms a bridge between metal atoms?
In the above chemical reaction sequence “A’’ and “B” respectively are :
Salicylaldehyde is synthesized from phenol, when reacted with
Phenolic group can be identified by a positive
Yellow compound of lead chromate gets dissolved on treatment with hot NaOH solution. The product of lead formed is a:
Structure of 4-Methylpent-2-enal is
The quantity which changes with temperature:
The interaction between π bond and lone pair of electrons present on an adjacent atom is responsible for
Match List-I with the List-II
List-I
(Compound /
Species)		List-II
(Shape / Geometry)
(A) \(SF_4\)(I) Tetrahedral
(B) \(BrF_3\)(II) Pyramidal
(C) \(BrO_{3}^{-}\)(III) See saw
(D) \(NH^{+}_{4}\)(IV) Bent T-shape
Choose the correct answer from the options given below:
In the following sequence of reaction, the major products B and C respectively are :
Chemical reaction
Identify the following species in which \(d^2sp^3\) hybridization is shown by the central atom.
Which of the following compounds in 3d series does not show +3 oxidation state?
The electronic configuration of Einsteinium is :(Given atomic number of Einsteinium = 99)
Choose the correct statements from the following:
A Ethane-1,2-diamine is a chelating ligand.
B Metallic aluminium is produced by electrolysis of aluminium oxide in presence of cryolite.
C Cyanide ion is used as a ligand for leaching of silver.
D Phosphine acts as a ligand in Wilkinson catalyst.
E The stability constants of \( \text{Ca}^{2+} \) and \( \text{Mg}^{2+} \) are similar to EDTA complexes.
Choose the correct option having all the elements with \( d^{10} \) electronic configuration from the following:
Given below are two statements: One is labelled as Assertion A and the other is labelled as Reason R:
Assertion A: The stability order of \(+1\) oxidation state of Ga, In, and Tl is \( \text{Ga}<\text{In}<\text{Tl} \).
Reason R: The inert pair effect stabilizes the lower oxidation state down the group.
In the light of the above statements, choose the correct answer from the options given below:
In acidic medium, \( K_2Cr_2O_7 \) shows oxidizing action as represented in the half-reaction: \(Cr_2O_7^{2-} + XH^+ + Ye^- \rightarrow 2A + ZH_2O\)
\( X \), \( Y \), \( Z \), and \( A \) are respectively:
When \( \text{MnO}_2 \) and \( \text{H}_2\text{SO}_4 \) is added to a salt (A), the greenish yellow gas liberated as salt (A) is:
In which of the following compound central atom has +4 oxidation state?
The correct statements among the following, for a "chromatography" purification method is:
Which one of the following reactions is NOT possible?
Given below are two statements:
Statement (I) : S$_N$2 reactions are 'stereospecific', indicating that they result in the formation only one stereo-isomers as the product.
Statement (II) : S$_N$1 reactions generally result in formation of product as racemic mixtures.
In the light of the above statements, choose the correct answer from the options given below :