Time required for completion of ionic reactions in comparison to molecular reactions is

For a chemical reaction....can never be a fraction

An elementary reaction between $A$ and $B$ is a second order reaction. Which of the following rate equations must be correct?

The given plots represent the variation of the concentration of a reactant $R$ with time for two different reactions $(i)$ and $(ii).$ The respective orders of the reactions are

For reaction
$X_2(g) + Y_2(g) \rightarrow  2XY (g)$

The following data are observed

Rate constant of reaction will (in $M^{1-n}\,sec^{-1}$) where $'n'$ is order of reaction 

The rate of the reaction :

$2N_2O_5 \rightarrow 4NO_2 + O_2$ can be written in three ways.

$\frac{-d[N_2O_5 ]}{dt} = k[N_2O_5]$

$\frac{d[NO_2 ]}{dt} = k'[N_2O_5]\,;$   $\frac{d[O_2 ]}{dt} = k"[N_2O_5]$

The relationship between $k$ and $k'$ and betweenk and $k''$ are