In the reaction $2A + B \to {A_2}B$, if the concentration of $A$ is doubled and of $B$ is halved, then the rate of the reaction will

If in a certain reaction, two different reactants take part then

The rate constant of the reaction $2H_2O_2(aq) \to  2H_2O(aq) + O_2(g)$ is $3\times10^{-3}\, min^{-1}$. At what concentration of $H_2O_2$, the rate of reaction will be $2\times10^{-4}\, M\, s^{-1}$ ? ............ $M$

For the reaction $2NO_2 + F_2 \to  2NO_2F$, following mechanism has been provided :
$N{O_2} + {F_2}\xrightarrow{{slow}}N{O_2}F + F$
$N{O_2} + {F_2}\xrightarrow{{fast}}N{O_2}F$
Thus rate expression of the above reaction can be written as

In a reaction, the concentration of reactant is increased two times and three times then the increases in rate of reaction were four times and nine times respectively, order of reaction is

The value of $\frac{{{t_{0.875}}}}{{{t_{0.50}}}}$ for $n^{th}$ order reaction is