List of top Chemistry Questions

The value of Planck's constant $(h)$ is $6.63 \times 10^{-34} Js$. The velocity of light is $3.0 \times 10^{8} ms ^{-1}$. Which value is closest to the wavelength (in meters) of a quantum of light with frequency of $8 \times 10^{15} s ^{-1}$ ?

A compound $M_{p} X_{q}$ has cubic close packing (ccp) arrangement of X. Its unit cell structure is shown below. The empirical formula of the compound is

If �a� stands for the edge length of the cubic systems : simple cubic, body centred cubic and face centred cubic, then the ratio of radii of the spheres in these systems will be respectively,

1 -Propanol and 2-propanol can be distinguished by

The half life period of a first order chemical reaction is 6.93 minutes. The time required for the completion of 99% of the chemical reaction will be (log 2 = 0.301)

What is $Z$ in the following sequence of reactions? $\text{Phenol}\xrightarrow[\text{dust}]{Zn} X \xrightarrow[{\text{Anhyd}}.AlCl_3]{CH_3Cl} Y \xrightarrow[KMnO_4]{\text{Alkaline}}Z$

1 gram of a carbonate $(M_2CO_3)$ on treatment with excess $HCl$ produces $0.01186$ mole of $CO_2$. The molar mass of $M_2CO_3$ in g $mol^{-1}$ is :

Excess of $NaOH_{(aq)}$ was added to $100\, mL$ of ${ FeCl_3}$ (aq) resulting into $2.14\, g$ of ${Fe(OH)_3}$. The molarity of ${FeCl_3}$ (aq) is : (Given molar mass of ${Fe = 56 \, g \, mol^{-1}}$ and molar mass of ${Cl = 35.5 \, g \, mol^{-1}}$)

For a reaction, $ {A_(g) \to A_(l); \Delta H = - 3RT}$. The correct statement for the reaction is :

According to Henry's law, the volume of a gas dissolved in a solvent at a given temperature is

$sp^3d^2$ hybridization is not displayed by :