List of top Chemistry Questions

The Avogadro constant $6.022140857 \times 10^{23$ is defined as the number of atoms present in exactly 12 g of ..........}

The principle of column chromatography is :

The correct structure of histidine in a strongly acidic solution (pH=2) is

An organic compound $'A'$ is oxidized with ${Na2O2}$ followed by boiling with ${HNO3}$. The resultant solution is then treated with ammonium molybdate to yield a yellow precipitate. Based on above observation, the element present in the given compound is :

$ {NO_2}$ required for a reaction is produced by the decomposition of $ {N2O5}$ in $ {CCl4}$ as per the equation $ { 2N2O5(g) -> 4NO2(g) + O2(g).}$ The initial concentration of $ {N2O5}$ is $3.00\, mol$ $ {L^{-1}}$ and it is $2.75\, mol$ $ {L^{-1}}$ after $30$ minutes. The rate of formation of $ {NO2}$ is :

The correct order of the atomic radii of $C, Cs, Al$ and $S$ is :

The ratio of number of atoms present in a simple cubic, body centered cubic and face centered cubic structure are, respectively :

The noble gas that does NOT occur in the atmosphere is:

The oxoacid of sulphur that does not contain bond between sulphur atoms is :

The process with negative entropy change is :

The lanthanide ion that would show colour is-

The number of water molecule(s) not coordinated to copper ion directly in $CuSO_4.5H_2O$, is :

The IUPAC symbol for the element with atomic number $119$ would be :

Two solids dissociate as follows $ {A(s) <=> B(g) + C(g) ; K_{p_1} = x \; atm^2}$ $ {D(s) <=> C(g) + E(g) ; K_{p_2} = y \; atm^2}$ The total pressure when both the solids dissociate simultaneously is :

In the cell ${Pt(s) | H_2(g , 1 bar | HCl(aq) | Ag(s) | Pt(s)} $ the cell potential is 0.92 when a $10^{-6}$ molal HCl solution is used. THe standard electrode potential of ${(AgCl/Ag,Cl^{-})}$ electrode is : $\left\{ \text{given} , \frac{2.303RT}{F} = 0.06 V \; at \; 298K\right\}$