The Mechanism for the Reaction H₂(g) + 2 ICl(g) $\rightarrow$ 2 HCl(g) + I₂(g) Is Proposed to Be:
Step

The mechanism for the reaction H₂(g) + 2 ICl(g) $\rightarrow$ 2 HCl(g) + I₂(g) is proposed to be:
Step 1: H₂(g) + ICl(g) $\rightarrow$ HI(g) + HCl(g) (slow)
Step 2: HI(g) + ICl(g) $\rightarrow$ I₂(g) + HCl(g) (fast)
What is the molecularity of the rate-determining step?

A) zeromolecular
B) unimolecular
C) bimolecular
D) termolecular
E) More information is needed.