4. The graph in Figure 1 illustrates various trends of the initial reaction rate (ro) with regards to the catalyst surface coverage of species A (@x) for a gaseous reaction: A+B 5C+D. [AS] Note: A = where [AS] is the concentration of intermediate species AS on the [Stotal' catalyst surface and [Sltotal is the total concentration of the catalyst active site. ro Vr V ruha BA BA 1 2 3 4 5 Figure 1. The profile of initial reaction rate (ro) with regards to @ A. By referring to Figure 1, a) Suppose the surface reaction is fast, which curve best describes Eley-Rideal mechanism, where only one of the reactants is adsorbed on the catalyst surface? Briefly justify your