List of top Chemistry Questions asked in JEE Main

Identify the product (P) in the following reaction:

The number of optical isomers in following compound is : _____.

Among the following halogens \(F_2, \, Cl_2, \, Br_2, \, \text{and} \, I_2\)
Which can undergo disproportionation reaction?

Iron (III) catalyses the reaction between iodide and persulphate ions, in which
A. \(\text{Fe}^{3+}\) oxidises the iodide ion
B. \(\text{Fe}^{3+}\) oxidises the persulphate ion
C. \(\text{Fe}^{2+}\) reduces the iodide ion
D. \(\text{Fe}^{2+}\) reduces the persulphate ion
Choose the most appropriate answer from the options given below:

Given below are two statements:
Statement I: \(N(CH_3)_3\) and \(P(CH_3)_3\) can act as ligands to form transition metal complexes.
Statement II: As \(N\) and \(P\) are from the same group, the nature of bonding of \(N(CH_3)_3\) and \(P(CH_3)_3\) is always the same with transition metals.
In the light of the above statements, choose the most appropriate answer from the options given below:

Match List-I with List-II.

List-I (Elements)	List-II (Properties in their respective groups)
(A) Cl,S	(I) Elements with highest electronegativity
(B) Ge, As	(II) Elements with largest atomic size
(C) Fr, Ra	(III) Elements which show properties of both metals and non metal
(D) F, O	(IV) Elements with highest negative electron gain enthalpy

Choose the correct answer from the options given below:

Match List-I with List-II

List-I (Compound)	List-II (Colour)
(A) \(Fe_4[Fe(CN)_6]_3.xH_2O\)	(I) Violet
(B) \( [Fe(CN)_5NOS]^{4–} \)	(II) Blood Red
(C) \( [Fe(SCN)]^{2+}\)	(III) Prussian Blue
(D) \((NH_4)_3PO_4.12MoO_3\)	(IV) Yellow

Choose the correct answer from the options given below:

In the given compound, the number of 2° carbon atom/s is _____.

Which of the following are aromatic?

Thiosulphate reacts differently with iodine and bromine in the reaction given below:
\[ 2S_2O_3^{2-} + I_2 \rightarrow S_4O_6^{2-} + 2I^- \]\[ S_2O_3^{2-} + 5Br_2 + 5H_2O \rightarrow 2SO_4^{2-} + 4Br^- + 10H^+ \]
Which of the following statements justifies the above dual behaviour of thiosulphate?

The incorrect statement regarding the given structure is

An octahedral complex with the formula \(\text{CoCl}_3n\text{NH}_3\) upon reaction with excess of \(\text{AgNO}_3\) solution gives 2 moles of \(\text{AgCl}\). Consider the oxidation state of Co in the complex is \(x\). The value of "x + n" is ______.

Match List-I with List-II.

List-I (Molecule)	List-II (Shape)
(A) \(NH_3\)	(I) Square pyramid
(B) \(BrF_5\)	(II) Tetrahedral
(C) \(PCL_5\)	(III) Trigonal pyramidal
(D) \(CH_4\)	(IV) Trigonal bipyramidal

Choose the correct answer from the options given below:

For the given hypothetical reactions, the equilibrium constants are as follows:
\[ X \rightleftharpoons Y; \, K_1 = 1.0 \]
\[ Y \rightleftharpoons Z; \, K_2 = 2.0 \]
\[ Z \rightleftharpoons W; \, K_3 = 4.0 \]
The equilibrium constant for the reaction
\[ X \rightleftharpoons W\]
is:

Match List-I with List-II.

List-I (Name of the test)	List-II (Reaction sequence involved) [M is metal]
(A) Borax bead test	I
(B) Charcoal cavity test	II
(C) Cobalt nitrate test	III
(D) Flame test	IV

Choose the correct answer from the options given below:

Combustion of glucose (\(C_6H_{12}O_6\)) produces \(CO_2\) and water. The amount of oxygen (in g) required for the complete combustion of \(900 \, \text{g}\) of glucose is:
\([ \text{Molar mass of glucose in g mol}^{-1} = 180 ]\)

Given below are two statements:
Statement I:

IUPAC name of Compound A is 4-chloro-1, 3-dinitrobenzene.
Statement II:

IUPAC name of Compound B is 4-ethyl-2-methylaniline.
In the light of the above statements, choose the most appropriate answer from the options given below:

Which among the following compounds will undergo fastest \(S_N2\) reaction?

Identify the major products A and B respectively in the following set of reactions.

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:

Compare the energies of following sets of quantum numbers for multielectron system.
(A) n = 4, 1 = 1
(B) n= 4, l = 2
(C) n = 3, l = 1
(D) n = 3, l = 2
(E) n = 4, 1 = 0
Choose the correct answer from the options given below :

For the given compounds, the correct order of increasing \(pK_a\) value :

A solution is prepared by adding 1 mole ethyl alcohol in 9 mole water. The mass percent of solute in the solution is ___________ (Integer Answer)
(Given : Molar mass in g mol$^{-1}$ Ethyl alcohol : 46, water : 18)

Molality of an aqueous solution of urea is 4.44 m. Mole fraction of urea in solution is x × 10^–3. Value of x is _______. (integer answer)