When the temperature of a reaction is raised by $10^{\circ}C$,how many times the rate will be enhanced?

In the plot of $\ln k$ versus $\frac{1}{T}$,what do the slope and intercept represent?

For the decomposition of $N_2O_5,$ the reaction is $2N_2O_{5(g)} \rightarrow 4NO_{2(g)} + O_{2(g)}$ with activation energy $E_a.$ If the reaction is written as $N_2O_{5(g)} \rightarrow 2NO_{2(g)} + 1/2 O_{2(g)}$ with activation energy $E_a',$ what is the relationship between $E_a$ and $E_a'$?

What is the role of a catalyst in a catalytic reaction?

For an exothermic reaction,the following two steps are involved:
Step $1$: $A + B \to I$ $(slow)$
Step $2$: $I \to AB$ $(fast)$
Which of the following graphs correctly represents this reaction?

For an effective collision to occur,the colliding molecules must possess: