List of top Chemistry Questions asked in JEE Main

The amount of arsenic pentasulphide that can be obtained when 35.5 g arsenic acid is treated with excess ${H_2S}$ in the presence of conc. HCl ( assuming 100% conversion) is :

At $300 \,K$ and $1 \,atm , 15\, mL$ of a gaseous hydrocarbon requires $375\, mL$ air containing $20 \% O _{2}$ by volume for complete combustion. After combustion the gases occupy $330\, mL$. Assuming that the water formed is in liquid form and the volumes were measured at the same temperature and pressure, the formula of the hydrocarbon is :

A stream of electrons from a heated filament was passed between two charged plates kept at a potential difference $V$ esu. If $e$ and $m$ are charge and mass of an electron, respectively, then the value of $h/ \lambda$ (where $\lambda$ is wavelength associated with electron wave) is given by :

The total number of orbitals associated with the principal quantum number 5 is :

At very high pressures, the compressibility factor of one mole of a gas is given by :

Galvanization is applying a coating of :

Extraction of copper by smelting uses silica as an additive to remove :

The following statements concern elements in the periodic table. Which of the following is true ?

Decomposition of $H_2O_2$ follows a first order reaction. In fifty minutes the concentration of $H_2O_2$ decreases from $0.5$ to $0.125 \,M$ in one such decomposition. When the concentration of $H_2O_2$ reaches $0.05 \,M$, the rate of formation of $O_2$ will be :

Gold numbers of some colloids are : Gelatin : 0.005 - 0.01, Gum Arabic : 0.15 - 0.25; Oleate : 0.04 - 1.0; Starch : 15 - 25. Which among these is a better protective colloid ?

Which of the following is an anionic detergent?

Identify the incorrect statement regarding heavy water :

Identify the reaction which does not liberate hydrogen :

Bouveault-Blanc reduction reaction involves :

The heats of combustion of carbon and carbon monoxide are $-393.5$ and $-283.5 \, kJ \, mol^{-1}$, respectively. The heat of formation (in $kJ$) of carbon monoxide per mole is :

The artificial sweetener that has the highest sweetness value in comparison to cane sugar is :

The reaction of zinc with dilute and concentrated nitric acid, respectively, produces :

An organic compound contains C, H and S. The minimum molecular weight of the compound containing 8% sulphur is : (atomic weight of S=32 amu)

Rayon is a semisynthetic polymer whose properties are better than natural cotton. Mechanical and aesthetic properties of cellulose can be improved by acetylation.

Oxidation of succinate ion produces ethylene and carbon dioxide gases. On passing $0.2$ Faraday electricity through an aqueous solution of potassium succinate, the total volume of gases (at both cathode and anode) at STP ($1\, atm$ and $273\, K$) is :

Two closed bulbs of equal volume $(V)$ containing an ideal gas initially at pressure $p_i$ and temperature $T_1$ are connected through a narrow tube of negligible volume as shown in the figure below. The temperature of one of the bulbs is then raised to $T_2$. The final pressure $p_f$ is :

The species in which the $N$ atom is in a state of $sp$ hybridization is :

The commercial name for calcium oxide is :

The distillation technique most suited for separating glycerol from spent-lye in the soap industry is :