List of top Chemistry Questions asked in JEE Main

The major product formed in the following reaction is:

Correct statements among $a$ to $d$ regarding silicones are : (a) They are polymers with hydrophobic character (b) They are biocompatible. (c) In general, they have high thermal stability and low dielectric strenth. (d) Usually, they are resistant to oxidation and used as greases.

The amphoteric hydroxide is :

The percentage composition of carbon by mole in methane is :

The structure of Nylon-6 is :

Consider the $bcc$ unit cells of the solids $1$ and $2$ with the position of atoms as shown below. The radius of atom $B$ is twice that of atom $A$. The unit cell edge length is $50\%$ more in solid $2$ than in $1$. What is the approximate packing efficiency in solid $2$ ?

${K_2HgI_4}$ is $40\%$ ionised in aqueous solution. The value of its van't Hoff factor (i) is :

If dichloromethane (DCM) and water ${(H_2O)}$ are used for differential extraction, which one of the following statements is correct ?

With respect to an ore, Ellingham diagram helps to predict the feasibility of its -

The pair that has similar atomic radii is :

Sodium metal on dissolution in liquid ammonia gives a deep blue solution due to the formation of:

For the following reactions, equilibrium constants are given : $S\left(s\right)+O_{2}\left(g\right) $${\rightleftharpoons}$$SO_{2}\left(g\right); K_{1} =10^{52}$ $2S\left(s\right)+3O_{2}\left(g\right) $${\rightleftharpoons}$$2SO_{3}\left(g\right); K_{2} = 10^{129}$ The eqilibrium constant for the reaction, $2SO_{2}\left(g\right)+O_{2}\left(g\right)$${\rightleftharpoons}$$2SO_{3}\left(g\right)$ is :

$ {Mn_2(CO)_{10}}$ is an organometallic compound due to the presence of :

A solution containing $62\, g$ ethylene glycol in $250 \,g$ water is cooled to $-10^{\circ}C$. If $K_f$ for water is $1.86\, K\, kg \,mol^{-1}$, the amount of water (in g) separated as ice is :

Haemoglobin and gold sol are examples of :

What would be the molality of $20\%$ (mass / mass) aqueous solution of $KI$? (molar mass of $KI = 166\, g\, mol^{-1}$)

The complex that has highest crystal feild splitting energy $(\Delta )$, is :

The pair that does NOT require calcination is:

Hall-Heroult's process is given by :

$C_{60}$, an allotrope of carbon contains :

Iodine reacts with concentrated ${HNO_3}$ to yield $Y$ along with other products. The oxidation state of iodine in $Y$, is :

The compound that inhibits the growth of tumors is :

NaH is an example of :

Liquids $A$ and $B$ form an ideal solution in the entire composition range. At $350\, K$, the vapor pressures of pure $A$ and pure $B$ are $7 \times 10^3$ Pa and $12 \times 10^3\, Pa$, respectively. The composition of the vapor in equilibrium with a solution containing $40$ mole percent of $A$ at this temperature is :

The metal d-orbitals that are directly facing the ligands in $ {K_3[Co(CN)_6]}$ are :