List of top Chemistry Questions asked in JEE Main

The complex of Ni$^{2+}$ ion and dimethyl glyoxime contains ____ number of Hydrogen (H) atoms.

20 mL of 2 M NaOH solution is added to 400 mL of 0.5 M NaOH solution. The final concentration of the solution is ___ x $ 10^{-2} $ M. (Nearest integer)

Consider the following molecules:

The order of rate of hydrolysis is:

A molecule with the formula $ \text{A} \text{X}_2 \text{Y}_2 $ has all it's elements from p-block. Element A is rarest, monotomic, non-radioactive from its group and has the lowest ionization energy value among X and Y. Elements X and Y have first and second highest electronegativity values respectively among all the known elements. The shape of the molecule is:

A transition metal (M) among Mn, Cr, Co, and Fe has the highest standard electrode potential $ M^{n}/M^{n+1} $. It forms a metal complex of the type $[M \text{CN}]^{n+}$. The number of electrons present in the $ e $-orbital of the complex is ... ...

Consider the following electrochemical cell at standard condition. $$ \text{Au(s) | QH}_2\text{ | QH}_X(0.01 M) \, \text{| Ag(1M) | Ag(s) } \, E_{\text{cell}} = +0.4V $$ The couple QH/Q represents quinhydrone electrode, the half cell reaction is given below: $$ \text{QH}_2 \rightarrow \text{Q} + 2e^- + 2H^+ \, E^\circ_{\text{QH}/\text{Q}} = +0.7V $$

0.1 mol of the following given antiviral compound (P) will weigh .........x $ 10^{-1} $ g.

Consider the following equilibrium, $$ \text{CO(g)} + \text{H}_2\text{(g)} \rightleftharpoons \text{CH}_3\text{OH(g)} $$ 0.1 mol of CO along with a catalyst is present in a 2 dm$^3$ flask maintained at 500 K. Hydrogen is introduced into the flask until the pressure is 5 bar and 0.04 mol of CH$_3$OH is formed. The $ K_p $ is ...... x $ 10^7 $ (nearest integer).
Given: $ R = 0.08 \, \text{dm}^3 \, \text{bar} \, \text{K}^{-1} \, \text{mol}^{-1} $
Assume only methanol is formed as the product and the system follows ideal gas behavior.

For the reaction $ A \rightarrow $ products,

The reaction was started with 2.5 mol L$^{-1}$ of A.

Consider the following compound (X):

The most stable and least stable carbon radicals, respectively, produced by homolytic cleavage of corresponding C - H bond are:

Identify the correct statement among the following:

Given below are two statements:
Statement I: The metallic radius of Al is less than that of Ga.
Statement II: The ionic radius of Al$^{3+}$ is less than that of Ga$^{3+}$.
In the light of the above statements, choose the most appropriate answer from the options given below:

Given below are two statements:
Statement I: High spin complexes have high values of $ \Delta_o $.
Statement II: Low spin complexes are formed when $ \Delta_o $ is high.
In the light of the above statements, choose the most appropriate answer from the options given below:

Choose the correct sets with respective observations:
(1) $ \text{CuSO}_4 $ (acidified with acetic acid) + $ K_2\text{Fe(CN)}_6 $ (neutralized with NaOH) → Blue precipitate
(2) $ 2\text{CuSO}_4 $ + $ K_2\text{Fe(CN)}_6 $ → Blue precipitate
(3) $ 4\text{FeCl}_3 $ + $ 3\text{K}_4\text{Fe(CN)}_6 $ → $ \frac{1}{2}K_4\text{Fe(CN)}_6 $
(4) $ 37\text{Cl}_2 $ + $ 2\text{KFe(CN)}_6 $ → 6KC1
In the light of the above options, choose the correct set:

On complete combustion 1.0 g of an organic compound (X) gave 1.46 g of CO₂ and 0.567 g of H₂O. The empirical formula mass of compound (X) is:
(Given molar mass in g mol$^{-1}$: C: 12, H: 1, O: 16)

If equal volumes of AB and XY (both are salts) aqueous solutions are mixed, which of the following combination will give precipitate of AY, at 300 K?

Among SO₃, NF₃, NH₃, XeF₂, CIF, and SF₆, the hybridization of the molecule with non-zero dipole moment and one or more lone-pairs of electrons on the central atom is:

Given below are two statements:
Statement I: Vanillin will react with NaOH and also with Tollen’s reagent.

Statement II: Vanillin will undergo self-aldol condensation very easily.

In the light of the above statements, choose the most appropriate answer from the options given below: