List of top Chemistry Questions

0.0025 has _________ significant figure

The molecular formula of dithionic acid is

Which of the following is atypical element?

The de Broglie wavelengths of electron waves in two orbits is 3:5. The ratio of kinetic energy of electrons will be

The pyknometric density of sodium chloride crystal is 2.165x 10³ kg m^-3 while its X-ray density is 2.178 x10³ kg m^-3 . The fraction of the unoccupied sites in sodium chloride crysstal is

The sharp melting point of a crystalline solid is due to

Which of the following species is not paramagnetic?

$3$-Methylpent-$2$-ene on reaction with $HBr$ in presence of peroxide forms an addition product. The number of possible stereoisomers for the product is :

Which of the following ions does not liberate hydrogen gas on reaction with dilute acids?

Among the following, the essential amino acid is :

Which of the following compounds will show highest dipole moment ?

Which of the following molecules is least resonance stabilized?

Addition of sodium hydroxide solution to a weak acid (HA) results in a buffer of pH 6. If ionisation constant of HA is $10^{-5}$, the ratio of salt to acid concentration in the buffer solution will be :

$pK_a$ of a weak acid (HA) and $pK_b$ of a weak base (BOH) are $3.2$ and $3.4,$ respectively. .The pH of their salt (AB) solution is :

What quantity (in mL) of a $45\%$ acid solution of a monoprotic strong acid must be mixed with a $20\%$ solution of the same acid to produce $800\ mL$ of a $29.875\%$ acid solution ?

An ideal gas undergoes isothermal expansion at constant pressure. During the process :

If the shortest wavelength in Lyman series of hydrogen atom is $A$, then the longest wavelength in Paschen series of $He^{+}$ is :

$\Delta U $ is equal to :

At $300\, K$, the density of a certain gaseous molecule at $2$ bar is double to that of dinitrogen $(N_2)$ at $4$ bar. The molar mass of gaseous molecule is :

Among the following, the incorrect statement is :

Hydrolysis of cyanohydrin derivative produces

How do you distinguish chlorobenzene A C from benzyl chloride ?

Identify the monomers from the following.

Identify the correct statement.

Which of the following do not contain carbon-oxygen double bonds?