Question

answer: a o(g) b o₂(g) c o₃(g) d no(g) e no₂(g) for the following reaction mechanism, what is the catalyst? o(g) + o₂(g) → o₃(g) o₂(g) + no₂(g) → o₃(g) + no(g) no(g) + o₂(g) → no₂(g) + o(g)

Explanation:

Step1: Recall the concept of catalysts

A catalyst is a substance that speeds up a chemical - reaction without being consumed in the reaction. In the given reaction mechanisms, we need to identify a species that appears as a reactant in one step and is regenerated as a product in another step.

Step2: Analyze the reaction mechanisms

In the reaction mechanisms provided, NO is consumed in one step (e.g., NO + O₂ → NO₂ + O) and is regenerated in another step (e.g., O₃+NO → O₂ + NO₂). So, NO is the catalyst.

Answer:

D. NO(g)