List of top Questions asked in JEE Main

Given below are two statements:
Statement (I): A \(\pi\) bonding MO has lower electron density above and below the inter-nuclear axis.
Statement (II): The \(\pi^*\) antibonding MO has a node between the nuclei.
In the light of the above statements, choose the most appropriate answer from the options given below:
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:
Which one the following compounds will readily react with dilute NaOH?

IUPAC name of \(K_2MnO_4\) is

The correct order of first ionization enthalpy values of the following elements is :
(A) O (B) N (C) Be (D) F (E) B
Choose the correct answer from the options given below :
Chemical Reaction
What is the structure of C ?
The reaction at cathode in the cells commonly used in clocks involves.
Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R).
Assertion (A): The total number of geometrical isomers shown by [Co(en)$_2$Cl$_2$]$^+$ complex ion is three.
Reason (R): [Co(en)$_2$Cl$_2$]$^+$ complex ion has an octahedral geometry.
In the light of the above statements, choose the most appropriate answer from the options given below:
On which factor, electrical conductivity of electrolytic cell does not depend
Which among the following halide/s will not show S$_N$1 reaction:
Problem Fig
Choose the most appropriate answer from the options given below:
The major product(P) in the following reaction is
Reaction
Match List-I with the List-II
List-I
Tetrahedral Complex		List-II
Electronic configuration
(A) TiCl4(I) e2, t20
(B) [FeO4]2-(II) e4, t23
(C) [FeCl4]-(III) e0, t22
(D) [CoCl4]2-(IV) e2, t23
Choose the correct answer from the options given below:
What is the order of reducing character for \(AsH_3, NH_3, PH_3\) (group \(15\) hydrides)?
Identify the product A in the following reaction.
Reaction
Find out the final product C
Find out the final product C
Lassaigne's test is used for detection of :
A first row transition metal in its +2 oxidation state has a spin-only magnetic moment value of 3.86 BM. The atomic number of the metal is
The correct set of four quantum numbers for the valence electron of rubidium atom (Z = 37) is:
Alkaline KMnO4 Oxidised iodide to a particular product (A). Determine the oxidation state of iodine in the compound (A).
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:
The correct statement about Zn, Cd, Hg are
Which of the following compounds show colour due to d-d transition?
Aluminium chloride in acidified aqueous solution forms an ion having geometry:
The incorrect statement regarding the geometrical isomers of 2-butene is:
0.05M CuSO$_4$ when treated with 0.01M K$_2$Cr$_2$O$_7$ gives green colour solution of Cu$_2$Cr$_2$O$_7$. The \[ \text{[SPM : Semi Permeable Membrane]} \]
\(K_2Cr_2O_7\)\(CuSO_4\)
Side XSPMSide Y

Due to osmosis: