List of top Chemistry Questions asked in JEE Main

If $50\%$ of a reaction occurs in $100$ second and $75\%$ of the reaction occurs in $200$ second, the order of this reaction is :

Which one of the following is not a property of physical adsorption?

The increasing order of diazotisation of the following compounds is :

In the leaching method, bauxite ore is digested with a concentrated solution of NaOH that produces ?X?. When $CO_2$ gas is passed through the aqueous solution of ?X?, a hydrated compound ?Y? is precipitated. ?X? and ?Y? respectively are :

Which of the following statements is false?

When metal ? $M$ ? is treated with $NaOH$, a white gelatinous precipitate ?$X$? is obtained, which is soluble in excess of $NaOH$. Compound ?$X$? when heated strongly gives an oxide which is used in chromatography as an adsorbent. The metal ?$M$? is :

In \(XeO_3F_2\), the number of bond pair(s), \(\pi\)-bond(s) and lone pair(s) on \(Xe\) atom respectively are :

Which of the following best describes the diagram below of a molecular orbital ?

Which of the following arrangements shows the schematic alignment of magnetic moments of antiferromagnetic substance ?

A group 13 element 'X' reacts with chlorine gas to produce a compound $XCl _{3} . XCl _{3}$ is electron deficient and easily reacts with $NH _{3}$ to form $Cl _{3} X \leftarrow NH _{3}$ adduct; however, $XCl _{3}$ does not dimerise. $X$ is

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 :

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 ${Cl = 35.5 \, g \, mol^{-1}}$)

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 ?

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

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 :