List of top Chemistry Questions asked in JEE Main

Given below are two statements :
Statement I : The decrease in first ionization enthalpy from B to Al is much larger than that from Al to Ga.
Statement II : The d orbitals in Ga are completely filled. In the light of the above statements,
choose the most appropriate answer from the options given below
One which does not stabilize secondary and tertiary protein?

We are given some diseases in Column II. Column-I contains name of some vitamins and their deficiencies will cause: 

Column-I

Column-II

(A)Vitamin A(p)Scurvy
(B)Vitamin B2(q)Xerophthalmia
(C)Vitamin B1 (Thiamine)(r)Cheilosis
(D)Vitamin C(s)Beri Beri
\(Pt(s) | H_{2_{(g)}} (1 bar) | H^{+}_{(aq)}(1M) || M^{3+}_{(aq)}, M^{+}_{(aq)} | Pt(s)\)
The Ecell for the given cell is 0.1115 V at 298 K when \(\frac{[M^+(aq)}{[M^{3+}(aq)]}=10^{a}\)
The value of a is _________
Given: \(E^{\theta}_{M^{3+}/M^+}=0.2\;V\)
\(\frac{2.303RT}{F}=0.059V\)
How many of the following statements are correct:
Prolonged heating of ferrous ammonium sulphate is avoided to prevent :
A solution of \(C_rO_5 \) in amyl alcohol has a _____ colour.
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.
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.
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?
Which of the following free radicals helps in depletion of the ozone layer?

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

The enthalpy change for the adsorption process and micelle for mation respectively are
On heating, $LiNO_3$ gives how many compounds among the following?
$Li_2O,N_2,O_2,LiNO_2,NO_2 $
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).
Find out the major product for the following reaction.
Find out the major product for the following reaction.
The increasing order of metallic character
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 _____ .
The octahedral diamagnetic low spin complex among the following is

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 ____ .