List of top Chemistry Questions asked in JEE Main

Read the following two statements:
Statement I: Potassium dichromate is used in volumetric analysis.
Statement II: \(K_2Cr_2O_7\) is more soluble in water than \(Na_2Cr_2O_7\)
In which of the following options the species changes from paramagnetic to diamagnetic and bond order increases.
Given below are two statements: one is labeled as Assertion (A) and the other is labeled as Reason (R).
Statement-1: According to Bohr’s Model, angular momentum is Quantized for stationary orbits.
Statement-2: Bohr’s Model doesn’t follow Heisenberg’s Uncertainty Principle.
In the light of the above statements, write the detailed answer:
The major component of which of the following ore is sulphide based mineral?
The concentration of dissolved Oxygen in water for growth of fish should be more than 𝑋 ppm and Biochemical Oxygen Demand in clean water should be less than 𝑌 ppm. X and Y in ppm are, respectively.
The octahedral diamagnetic low spin complex among the following is
Find out the major product for the following reaction.
Find out the major product for the following reaction.
When 0.01 mol of an organic compound containing 60% carbon was burnt completely, 4.4 g of $CO_2$ was produced. The molar mass of compound is _______ $gmol^{−1}$. (Nearest integer).
The enthalpy change for the adsorption process and micelle for mation respectively are
How many of the following statements are correct:
On heating, $LiNO_3$ gives how many compounds among the following?
$Li_2O,N_2,O_2,LiNO_2,NO_2 $
Select the correct option:
\(2CO (g) + O_2 (g) → 2CO_2 (g) ; ΔH = -x KJ/mol\)
\(C (graphite) + O_2(g) → CO_2 (g) ; AH = -y KJ/mol\)
Then AH for, \(C(graphite) + \frac{1}{2} O_2 (g) → CO (g):\)
For conversion of compound \(A→B\), the rate constant of the reaction was found to be $4.6×10^{−5} L mol^{−1} s^{−1}$. The order of the reaction is _____ .

Which of the following is used as a stabilizer during the concen tration of sulphide ores?

Which of the following free radicals helps in depletion of the ozone layer?

Ion having highest hydration enthalpy among the given alkaline earth metal ions is:

In which form does \(BeCl_{2}\) exist in the solid state, vapor state and high temperature?
(1) Polymeric, Dimeric, Monomeric
(2) Dimeric, Polymeric, Monomeric
(3) Monomeric, Dimeric, Polymeric
(4) Polymeric, Monomeric, Dimeric

The product , which is not obtained during the electrolysis of brine solution is ____ .
Consider the following reaction that goes from A to B in three steps as shown
Consider the following reaction that goes from A to B in three steps as shown
below Choose the correct option:
The volume of 0.02 M aqueous HBr required to neutralize 10.0 mL of 0.01 M aqueous Ba(OH)2 is ____ . (Assume complete neutralization)
For a metal ion, the calculated magnetic moment is 4.90 BM. This metal ion has ______ number of unpaired electrons.
The solubility product of BaSO₄ is \(1 \times 10^{-10}\) at 298 K. The solubility of BaSO₄ in 0.1 M K₂SO₄(aq) is \(x \times 10^{-9}\) g L⁻¹. Calculate the value of \(x\).
Compounds of Xenon have one electron pair on central atom :
Which of the following acts as a stabilizer in the decomposition of H2O2?
The ratio of silica to alumina in cement is: