Carefully examine the following reaction sequence for the catalytic formation of ozone, O3, from molecular oxygen, O2. Which chemical compound is behaving as the catalyst? O2 + 2 NO ? 2 NO2 2 NO2 ? 2 NO + 2 O 2 O + 2 O2 ? 2 O3

A. nitrogen dioxide, NO2
B. oxygen, O2
C. atomic oxygen, O
D. nitrogen monoxide, NO


Answer: D

Environmental & Atmospheric Sciences

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