The diagram illustrates how the molecular energies are distributed in a gas sample at temperature $T_1$. The activation energy for the gas’s uncatalysed reaction, $E_a(\text{uncat})$, is indicated. Which diagram most accurately displays the revised distribution and the revised activation energy, $E_a(\text{cat})$, after the temperature is raised to $T_2$, and a catalyst is added to increase the reaction rate?
Chemistry 9701 · AS & A Level · Reaction kinetics