List of top Chemistry Questions

Which of the following is the correct relation of the first law of thermodynamics?

Which has lowest thermal stability?

The unit in which the solubility product of barium phosphate is expressed as

The term antibiotic was coined by:

The pH value of $0.1\, M\, NaOH$ solution is (when there is a given reaction $\left.\left[ H ^{+}\right]\left[ OH ^{-}\right]=10^{-14}\right)$

The equivalent conductance of $Ba^{2+}$ and $Cl^-$ are respectively $127$ and $76 \,ohm^{-1}\,cm^2\, eq^{-1}$ at infinite dilution. What will be the equivalent conductance of $BaCl_2$ at infinite dilution?

The energy of photon is given as : $\Delta $E/atom= $3.03 \times 10^{-19} J atom^{-1},$ then the wavelength $(\lambda)$ of the photon is (Given, h(Planck's constant) $=6.63 \times 10^{-34}$ Js, c (velocity of light) $= 3.00 \times 10^8 ms^{-1}$

The combustion enthalpies of carbon, hydrogen and methane are $-395.5\, kJ\, mol ^{-1},-284.8\, kJ\, mol ^{1}$ and $-890.4\, kJ \,mol ^{-1}$ respectively at $25^{\circ} C$. The value of standard formation enthalpies of methane at that temperature is

The boiling point of $CCl _{4}$ is higher than that of $CHCl _{3}$ because

The boiling point of heavy water is

Sodium thiosulphate is used in photography to

Shape of $Fe(CO)_5$ is

Scurvy is caused due to deficiency of

Salicylic acid is prepared from phenol by

Role of enzyme in reactions is to/as

Richest source of vitamins C is:

Portland cement contains the following amount of $CaO$

Maximum frequency of emission is obtained for the transition

Bauxite is concentrated by :

Ammonia and sodium hypochlorite reacts to produce :

Physical adsorption is inversely proportional to :

The alcohol manufactured from water gas is :

$ K_4[Fe(CN)_6]$ is a

One mole of an ideal gas is allowed to expand reversibly and adiabatically from a temperature of $27^{\circ} C$ The work done is $3 \,kJ$. The final temperature of the gas is equal to $\left[C_{v}=20\, K J^{-1}\right]:$

IUPAC name of $Na_3 [Co (NO_2 )_6 ]$ is