List of top Chemistry Questions

An ionic compound has a unit cell consisting of A ions at the corners of a cube and B ions on the centres of the faces of the cube. The empirical formula for this compound would be

One mole of an ideal gas at 300 K is expanded isothermally from an initial volume of 1 litre to 10 litres. Then $ {\Delta S (cal \, deg^{-1} \, mol^{-1})}$ for this process is : $ { (R = 2 \, cal \, K^{-1} \, mol^{-1})}$

The protein present in the hair is

Phenol undergoes electrophilic substitution more easily than benzene because

Esterification of acid chloride with ethanol is usually carried out in the presence of pyridine. The function of pyridine is

Group 15 elements have more electron gain enthalpy than group 16-elements. The correct reason for this 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 :

A solid XY kept in an evacuated sealed container undergoes decomposition to form a mixture of gases X and Y at temperature T. The equilibrium pressure is 10 bar in this vessel. $K_p$ for this reaction is :

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

An aqueous solution of a salt $MX_2$ at certain temperature has a van?t Hoff factor of 2. The degree of dissociation for this solution of the salt is :

The root means square velocity of hydrogen at $ STP $ is $ 1.83 \times 10^5 \,cm \, sec^{-1} $ and its means free path is $ 1.78 \times 10^{-5} \,cm $ . What will be the collision number at $ STP $ ?

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 :

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

The hybridizations of atomic orbitals of nitrogen in $NO _{2}^{+}, NO _{3}^{-}$ and $NH _{4}^{+}$ respectively are

The rate of a first order reaction is $0.04 mol \, l^{-1} \, s^{-1}$ at 10 seconds and $0.03 \, mol \, l^{-1} \, s^{-1}$ at 20 seconds after initiation of the reaction. The half-life period of the reaction is :

Match items of Column I with the items of Column II and assign the correct code:

The suspension of slaked lime in water is known as

The highest DDT concentration in aquatic food chain shall occur in

Natural rubber has :

$MY$ and $NY_3$, two nearly insoluble salts, have the same $K_{SP}$ values of $6.2 \times 10^{-13}$ at room temperature. Which statement would be true in regard to $MY$ and $NY_3$ ?

Which of the following statement about hydrogen is incorrect ?

Which of the following biphenyls is optically active ?

Which among the given molecules can exhibit tautomerism?

Lithium has a $bcc$ structure. Its density is $530 \, kg \, m^{-3}$ and its atomic mass is $6.94 \, g \, mol^{-1}$. Calculate the edge length of a unit cell of Lithium metal. ($NA = 6.02 \times 10^{23} \, mol^{-1}$)