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In the stratosphere, which step directly produces ozone from atomic oxygen?

A $O X_{3} O X_{2} + O$
B $2 O O X_{2}$
C $O X_{2} + O X_{2} O X_{3} + O$
D $O + O X_{2} O X_{3}$

Answer: D

Ultraviolet light first splits

O X_{2}

into two oxygen atoms. Each oxygen atom then combines with an

O X_{2}

molecule to give

O X_{3}

, i.e.

O + O X_{2} O X_{3}

. The other options are not the ozone-forming step.

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