List of top Chemistry Questions asked in JEE Main

In which of the following compounds Mn has the highest oxidation state?

Which metal shows the highest and maximum number of oxidation states?

Identify the change occuring in oxidation state of Mn in cell reaction of dry cell of clock during its use

One litre solution of 0.2 M glucose is separated with its pure solvent with semi-permeable membrane, 0.1 moles of NaCl is added to the solution. The change in osmotic pressure of solution will be at 300 K _____ . (take R = 0.083)

Sum of the number π and nt bonds in the ethylene molecule is x. The value of x is

Which of the following cation will give green colour in Borax bead test

If the number of neutrons in the most abundant isotope of boron is 'x' and its highest oxidation state in unsaturated compound is 'y', then find the value of (x+y).

What is the correct order of strength of following ligands according to the spectrochemical series?

Assertion: Trans But-2-ene is less polar than cis But-2-ene
Reason: Trans But-2-ene has zero dipole moment

Identify the correct Lewis dot structure of NO^-₂.

Consider the reaction:
Fe₂0₃(s) + 3CO(g) = 2Fe(s) + 3CO₂(g)
Which of the following will not affect the equilibrium state:
(I) Addition of Fe₂O₃
(II) Addition of CO₂
(III) Decreasing mass of Fe₂O₃
(IV) Removal of CO

How many of the given statements are true for fuel cell? 
A. It is a type of Galvanic cell 
B. It is used for providing electrical power in space programmes. 
c. Hydrogen and oxygen are bubbled through porous carbon electrodes into concentrated NaOH solution 
D. It produces electricity with an efficiency of 40% 
E. It is pollution free cell

The total number of chain isomers possible for a compound with molecular formula $C_7H_{16}$ are:

An element of d-block (Z) of 4th period has spin only magnetic moment of its $Z^{3+}$ form is 3.9 BM, then find minimum atomic number of element (Z).

Maximum number of orbitals possible when n = 4 and m = 0?

What is the maximum amount of acetanilide formed when acetic anhydride in excess is treated with 18 gm of aniline. (nearest integer)

Arrange the following anions in the decreasing order of their stability.

What is the sum of number of ɑ and π bonds present in 2-oxo-hex-4-yne-oic acid ?

Which one of the following has the most negative (highest –ve) electron gain enthalpy?

Which of the following is used as adsorbent in adsorption chromatography?

Consider the following statements:
Statement I: The number of emitted photoelectrons Increases with increase in frequency of incident light.
Statement II: Kinetic energy of emitted photoelectrons increases with increase in frequency of incident light

Find out number of unpaired electrons in d-subshell for $[Co(H_2O)_6]^{ 3+}. $

IUPAC name of Catechol is-