---
title: "The catalytic removal of pollutant gases from automobile exhaust includes the reduction of nitrogen monoxide, \\(\\text{NO}(g)\\), by carbon monoxide, \\(\\text{CO}(g)\\), over a solid platinum catalyst, as represented by the following equation:  \\[ 2\\,\\text{NO}(g) + 2\\,\\text{CO}(g) \\xrightarrow{\\text{Pt}(s)} \\text{N}_2(g) + 2\\,\\text{CO}_2(g) \\]  Which of the following correctly classifies the \\(\\text{Pt}(s)\\) catalyst and describes the primary mechanism by which it accelerates the reaction?"
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url: "https://nerd-notes.com/ubq/119792/"
date_modified: "2026-08-21T08:12:21+00:00"
---

# The catalytic removal of pollutant gases from automobile exhaust includes the reduction of nitrogen monoxide, \(\text{NO}(g)\), by carbon monoxide, \(\text{CO}(g)\), over a solid platinum catalyst, as represented by the following equation:

\[ 2\,\text{NO}(g) + 2\,\text{CO}(g) \xrightarrow{\text{Pt}(s)} \text{N}_2(g) + 2\,\text{CO}_2(g) \]

Which of the following correctly classifies the \(\text{Pt}(s)\) catalyst and describes the primary mechanism by which it accelerates the reaction?

The catalytic removal of pollutant gases from automobile exhaust includes the reduction of nitrogen monoxide, \(\text{NO}(g)\), by carbon monoxide, \(\text{CO}(g)\), over a solid platinum catalyst, as represented by the following equation:

\[ 2\,\text{NO}(g) + 2\,\text{CO}(g) \xrightarrow{\text{Pt}(s)} \text{N}_2(g) + 2\,\text{CO}_2(g) \]

Which of the following correctly classifies the \(\text{Pt}(s)\) catalyst and describes the primary mechanism by which it accelerates the reaction?

- **A.** Homogeneous | Increases the average kinetic energy of the reactant molecules, allowing a greater fraction of collisions to exceed \(E_a\)
- **B.** Homogeneous | Adsorbs reactant molecules onto surface active sites to weaken bonds, providing an alternate pathway with a lower \(E_a\)
- **C.** Heterogeneous | Increases the average kinetic energy of the reactant molecules, allowing a greater fraction of collisions to exceed \(E_a\)
- **D.** Heterogeneous | Adsorbs reactant molecules onto surface active sites to weaken bonds, providing an alternate pathway with a lower \(E_a\)

*The answer key and step-by-step explanation are available to logged-in users at https://nerd-notes.com/ubq/119792/*