List of top Chemistry Questions asked in JEE Main

1 gram of a carbonate $(M_2CO_3)$ on treatment with excess $HCl$ produces $0.01186$ mole of $CO_2$. The molar mass of $M_2CO_3$ in g $mol^{-1}$ is :

Excess of $NaOH_{(aq)}$ was added to $100\, mL$ of ${ FeCl_3}$ (aq) resulting into $2.14\, g$ of ${Fe(OH)_3}$. The molarity of ${FeCl_3}$ (aq) is : (Given molar mass of ${Fe = 56 \, g \, mol^{-1}}$ and molar mass of ${Cl = 35.5 \, g \, mol^{-1}}$)

For a reaction, $ {A_(g) \to A_(l); \Delta H = - 3RT}$. The correct statement for the reaction is :

$sp^3d^2$ hybridization is not displayed by :

The group having triangular planar structures is :

The electron in the hydrogen atom undergoes transition from higher orbitals to orbital of radius $211.6\, pm$. This transition is associated with

Which of the following species is not paramagnetic?

$3$-Methylpent-$2$-ene on reaction with $HBr$ in presence of peroxide forms an addition product. The number of possible stereoisomers for the product is :

Which of the following ions does not liberate hydrogen gas on reaction with dilute acids?

Among the following, the essential amino acid is :

Which of the following compounds will show highest dipole moment ?

Which of the following molecules is least resonance stabilized?

Addition of sodium hydroxide solution to a weak acid (HA) results in a buffer of pH 6. If ionisation constant of HA is $10^{-5}$, the ratio of salt to acid concentration in the buffer solution will be :

$pK_a$ of a weak acid (HA) and $pK_b$ of a weak base (BOH) are $3.2$ and $3.4,$ respectively. .The pH of their salt (AB) solution is :

What quantity (in mL) of a $45\%$ acid solution of a monoprotic strong acid must be mixed with a $20\%$ solution of the same acid to produce $800\ mL$ of a $29.875\%$ acid solution ?

An ideal gas undergoes isothermal expansion at constant pressure. During the process :

If the shortest wavelength in Lyman series of hydrogen atom is $A$, then the longest wavelength in Paschen series of $He^{+}$ is :

$\Delta U $ is equal to :

At $300\, K$, the density of a certain gaseous molecule at $2$ bar is double to that of dinitrogen $(N_2)$ at $4$ bar. The molar mass of gaseous molecule is :

Among the following, the incorrect statement is :

What is the standard reduction potential $(E^{\circ}) $ for ${Fe^{3+} \to Fe}$ ? Given that : ${Fe^{2+} + 2e^{-} -> Fe ; E^{\circ}_{Fe^{2+} / Fe} = - 0.47 V }$ ${Fe^{3+} + e^{-} -> Fe^{2+} ; E^{\circ}_{Fe^{3+} / Fe^{2+}} = + 0.77 V }$

Among the following, correct statement is :

Both lithium and magnesium display several similar properties due to the diagonal relationship; however, the one which is incorrect, is :

The electronic configuration with the highest ionization enthalpy is :

A water sample has ppm level concentration of following anions $F^{-} = 10 ;\, SO^{2-}_4 = 100 ;\, NO^{-}_3 = 50$ The anion/anions that make/makes the water sample unsuitable for drinking is / are :