---
title: "A proposed three-step mechanism for the coupled catalytic destruction of stratospheric ozone is represented below.  \\[\\text{Step 1: } \\text{Br(g)} + \\text{O}_3\\text{(g)} \\rightarrow \\text{BrO(g)} + \\text{O}_2\\text{(g)}\\] \\[\\text{Step 2: } \\text{Cl(g)} + \\text{O}_3\\text{(g)} \\rightarrow \\text{ClO(g)} + \\text{O}_2\\text{(g)}\\] \\[\\text{Step 3: } \\text{BrO(g)} + \\text{ClO(g)} \\rightarrow \\text{Br(g)} + \\text{Cl(g)} + \\text{O}_2\\text{(g)}\\]  Based on the proposed mechanism, which of the following correctly identifies the catalyst(s) and intermediate(s) in this reaction cycle?"
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url: "https://nerd-notes.com/ubq/123623/"
date_modified: "2026-09-28T12:01:48+00:00"
---

# A proposed three-step mechanism for the coupled catalytic destruction of stratospheric ozone is represented below.

\[\text{Step 1: } \text{Br(g)} + \text{O}_3\text{(g)} \rightarrow \text{BrO(g)} + \text{O}_2\text{(g)}\]
\[\text{Step 2: } \text{Cl(g)} + \text{O}_3\text{(g)} \rightarrow \text{ClO(g)} + \text{O}_2\text{(g)}\]
\[\text{Step 3: } \text{BrO(g)} + \text{ClO(g)} \rightarrow \text{Br(g)} + \text{Cl(g)} + \text{O}_2\text{(g)}\]

Based on the proposed mechanism, which of the following correctly identifies the catalyst(s) and intermediate(s) in this reaction cycle?

A proposed three-step mechanism for the coupled catalytic destruction of stratospheric ozone is represented below.

\[\text{Step 1: } \text{Br(g)} + \text{O}_3\text{(g)} \rightarrow \text{BrO(g)} + \text{O}_2\text{(g)}\]
\[\text{Step 2: } \text{Cl(g)} + \text{O}_3\text{(g)} \rightarrow \text{ClO(g)} + \text{O}_2\text{(g)}\]
\[\text{Step 3: } \text{BrO(g)} + \text{ClO(g)} \rightarrow \text{Br(g)} + \text{Cl(g)} + \text{O}_2\text{(g)}\]

Based on the proposed mechanism, which of the following correctly identifies the catalyst(s) and intermediate(s) in this reaction cycle?

- **A.** Catalysts: \(\text{Br(g)}\) and \(\text{Cl(g)}\); Intermediates: \(\text{BrO(g)}\) and \(\text{ClO(g)}\)
- **B.** Catalysts: \(\text{BrO(g)}\) and \(\text{ClO(g)}\); Intermediates: \(\text{Br(g)}\) and \(\text{Cl(g)}\)
- **C.** Catalysts: \(\text{Br(g)}\) and \(\text{ClO(g)}\); Intermediates: \(\text{Cl(g)}\) and \(\text{BrO(g)}\)
- **D.** Catalysts: \(\text{Br(g)}\) and \(\text{Cl(g)}\); Intermediates: \(\text{O}_3\text{(g)}\) and \(\text{O}_2\text{(g)}\)

*The answer key and step-by-step explanation are available to logged-in users at https://nerd-notes.com/ubq/123623/*