List of top Chemistry Questions asked in JEE Main

Given below are two statements: One is labelled as "Assertion A" and the other is labelled as "Reason R".
Assertion A: In the complex Ni(CO), and Fe(CO)s, the metals have zero oxidation state.
Reason R: Low oxidation states are found when a complex has ligands capable of π-donor character in addition to the o-bonding.
In the light of the above statements, choose the most appropriate answer from the option given below.

Group–13 elements react with \( O_2 \) in amorphous form to form oxides of type \( M_2O_3 \) (M = element). Which among the following is the most basic oxide?

The volume of HCl, containing $73 g L^{−1}$, required to completely neutralise NaOH obtained by reacting $0.69 g$ of metallic sodium with water, is _______ mL.( Nearest Integer)
(Given : molar Masses of Na, Cl, O, H, are 23,35.5,16 and 1 $g mol^{−1}$ respectively)

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 compound which does not exist.

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?

\(Pt(s) | H_{2_{(g)}} (1 bar) | H^{+}_{(aq)}(1M) || M^{3+}_{(aq)}, M^{+}_{(aq)} | Pt(s)\)
The E_cell 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.

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?

On heating, $LiNO_3$ gives how many compounds among the following?
$Li_2O,N_2,O_2,LiNO_2,NO_2 $

The octahedral diamagnetic low spin complex among the following is

The enthalpy change for the adsorption process and micelle for mation respectively are

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

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.

The increasing order of metallic character