List of top Chemistry Questions

For two isomorphous crystals A and B, the ratio of density of A to that of B is 1.6 while the ratio of the edge length of B to that of A is 2. If the molar mass of crystal B is 200 g mol$^{-1}$, then molar mass of crystal A is}

Which of the following changes in the respective bond order values are caused by removal of an electron from N$_2$ and F$_2$ molecules?

Aluminium (Atomic mass = 27) crystallizes in a cubic system with edge length of 4 \AA. Its density is 2.7 g cm$^{-3}$. The number of aluminium atoms present per unit cell is}

An odd electron molecule among the following is

The number of electrons with azimuthal quantum number \(l = 1\) and \(l = 2\) for Cr in ground state are respectively

The minimum values of uncertainties involved in the determination of both the position and velocity of a particle are respectively \(1\times10^{-10}\,m\) and \(1\times10^{-10}\,ms^{-1}\). Then, the mass (in kg) of the particle is

The threshold frequency of a metal corresponds to the wavelength of \(x\) nm. In two separate experiments ‘A’ and ‘B’, incident radiations of wavelengths \(\frac{x}{2}\) nm and \(\frac{x}{4}\) nm respectively are used. The ratio of kinetic energy of the released electrons in experiment ‘B’ to that in experiment ‘A’ is

Decreasing order of stability of $O_2, O^-_2, O_2^+ $ and ${ O_2^{2-}}$ is :

The number of water molecules is maximum in :

In which of the following pairs, both the species are not isostructural ?

Which of the statements given below is incorrect ?

The product of the reaction is:

I\(_2\) dissolves in KI solution due to formation of

The following reaction is an example of ... reaction.
\(\mathrm{C_2H_4Br_2 \xrightarrow{Alc.\ KOH} C_2H_2}\)

\(2.76\mathrm{g}\) of silver carbonate on being strongly heated yields a residue weighing

The ground state term symbol for an electronic state is governed by

Which of the following has largest ionic radius?

The isoelectronic pair is

Enthalpy is equal to

\(9.2\mathrm{g}\ \mathrm{N}_2\mathrm{O}_4\) is heated in 1L vessel till equilibrium state is established.
\(\mathrm{N}_2\mathrm{O}_4(\mathrm{g})\rightleftharpoons 2\mathrm{NO}_2(\mathrm{g})\)
In equilibrium state, \(50%\ \mathrm{N}_2\mathrm{O}_4\) was dissociated, equilibrium constant will be (molecular wt. of \(\mathrm{N}_2\mathrm{O}_4 = 92\))

In CsCl type structure, the coordination number of \(\mathrm{Cs}^{+}\) and \(\mathrm{Cl}^{-}\) respectively are

Calculate the molal depression constant of a solvent which has freezing point \(16.6^{\circ}\mathrm{C}\) and latent heat of fusion \(180.75\mathrm{J / g}\).

How long (in hours) must a current of 5.0 A be maintained to electroplate 60 g of calcium from molten \(\mathrm{CaCl}_2\)?

For the two gaseous reactions, following data:
\(A \rightarrow B; k_1 = 10^{10}e^{-20,000/T}\)
\(C \rightarrow D; k_2 = 10^{12}e^{-24,606/T}\)
the temperature at which \(k_1\) becomes equal to \(k_2\) is

In aerosol, the dispersion medium is