List of top Chemistry Questions

The value of Planck's constant is $6.63 \times 10^{-34} Js$. The speed of light is $3 \times 10^{17} nm \, s^{-1}$. Which value is closest to the wavelength in nanometer of a quantum of light with frequency of $6 \times 10^{15} \, s^{-1}$ ?
Identify the correct order of solubility in aqueous medium :
Dipole induced dipoloe interactions are present in which of the following pairs :-
In Goldschmidt aluminothermic process which of the following reducing agents is used:
The rate constant of a zero order reaction is $2.0 \times 10^{-2}\, mol \,L^{-1}\, s^{-1}$. If the concentration of the reactant after $25$ seconds is $0.5\,M$. What is the initial concentration ?
Copper crystallises in fcc with a unit length of $361\,pm$. What is the radius of copper atom ?
In which of the following pairs of molecules/ions both the species are not likely to exist?
In a face centred cubic lattice, atoms of $A$ form the comer points and atoms of $B$ form the face centred points. If two atoms of $A$ are missing from the comer points, the formula of the ionic compound is :
The first ionisation potential of $Na$ is $5.1\, eV$. The value of electron gain enthalpy of $Na^+$ will be
The number of carbon atoms per unit cell of diamond unit cell is :
Electron gain enthalpy with negative sign of fluorine is less than that of chlorine due to :
A near $UV$ photon of $300 \,nm$ is absorbed by a gas and then re-emitted as two photons. One photon is red with wavelength of the second photon is
A solution of copper sulphate $\left(CuSO_{4}\right)$ is electrolysed for 10 minutes with a current of $1.5$ amperes. The mass of copper deposited at the cathode (at. mass of $Cu = 63u$) is :
An excess of $AgNO_3$ is added to 100 mL of a 0.01 M solution of dichlorotetraaquachromium(III) chloride. The number of moles of $AgCl$ precipitated would be :
One mole of solid iron was vaporized in an oven at its boiling point of 3443 K and enthalpy of vaporization of iron is 344.3 kJ mol$^{-1}$. The value of entropy vaporization (in J mol$^{-1}$) of iron is
According to collision theory of chemical reactions rates of the reaction increase with increase in the temperature of a reaction because of
Specify the coordination number of cobalt in $\left[ Co ( CN )\left( H _{2} O \right)( en )_{2}\right]^{2+}$
What will be the freezing point of $1\%$ solution of glucose in water, given that molal depression constant for water is $ 1.84\,K\, mol^{-1}$
Which type of isomerism is exhibited by $\left[ Pt \left( NH _{3}\right)_{2} Cl _{2}\right]$ ?
Which of the following species has a trigonal planar shape?
When a solution of sodium hydroxide is added to acetic acid solution, the conductivity of the resulting solution will
The most stable oxidation state of lanthanides is
Which of the following is least reactive to nitration?
Pick out the wrong statement
Which of the following groups is ortho and para directing?