List of top Chemistry Questions

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

Ammonia and sodium hypochlorite reacts to produce :

Physical adsorption is inversely proportional to :

Bauxite is concentrated by :

$ 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 $\left[C_{v}=20\, K J^{-1}\right]:$

The alcohol manufactured from water gas is :

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

The strongest reducing agent of the alkali metal is:

Specific conductance of $0.1 \,N \,KCl$ solution at $23^{\circ} C$ is $0.012 \,ohm ^{-1} \,cm ^{-1}$. Resistance of cell containing the solution at same temperature was found to be $55 \,ohm$. The cell constant is:

In which of the following the angle between the two covalent bonds is maximum?