List of top Chemistry Questions

Identify the pair containing only Lewis acids.
How many moles of urea is present in \(250\text{ ml}\) of \(0.2M\) solution of it?
\(x\text{ ml}\) of \(0.1M\) NaOH solution is diluted with distilled water to get \(250\text{ ml}\) of \(0.01M\) solution. The value of \(x\) in ml is
\(3\times10^{22}\) molecules of \(Na_2CO_3\) molecular weight \(=106\) present in \(500\text{ ml}\) of solution. The normality of the solution formed is \(\left(N=6\times10^{23}\text{ mol}^{-1}\right)\)
\(4\text{ g}\) of NaOH is dissolved in \(1.0\text{ L}\) solution. The pH of solution is
Consider the elements with atomic numbers \(Z=8,9,11,19\) and \(20\). The number of ionic compounds possible with the elements having these atomic numbers is
If \(n,l,m\) and \(s\) represent the symbols of quantum numbers, the impossible quantum number set for the electron in terms of \(n,l,m\) and \(s\) respectively is
Consider the elements with atomic numbers \(Z=1\) to \(Z=20\). The number of elements with only one unpaired electron in their ground state is
Identify the orbital which has lobes not orienting on the axis
A cation vacancy and an anion vacancy in a crystal of type AB is called
The number of atoms per unit cell in FCC is
Liquefied petroleum gas (LPG) mainly contains
Which compound is mainly responsible for the depletion of ozone layer?
We can overcome the undesirable properties of natural rubber by heating natural rubber with
Greenhouse effect is caused by
The monomer involved in the formation of polystyrene is
Tarnishing of silver is due to formation of
The cell formed in bent pipes is an example of
In the removal of permanent hardness of water by permutit process, \(Na^+\) ions of permutit are exchanged with which ions of water?
What is the degree of hardness in ppm of a sample containing \(19\text{ mg}\) of \(MgCl_2\) molecular weight \(=95\) in \(2\text{ kg}\) water sample? Express it in terms of equivalents of \(CaCO_3\).
Which of the following is not a co-polymer?
Identify the pair of chlorides responsible for permanent hardness of water.
The standard electrode potentials of Zn, Ag and Cu are \(-0.76\), \(+0.80\) and \(+0.34\text{ V}\) respectively. Identify the correct statement from the following.
Identify the pair containing only Lewis acids.
Number of coulombs corresponding to \(1\text{ mol}\) of electrons approximately is equal to