Question

Ozone is formed when _______.
a.
two oxygen molecules combine
b.
an individual oxygen atom combines with an oxygen molecule
c.
ultraviolet radiation breaks apart four oxygen molecules
d.
oxygen molecules are broken into separate atoms

Answer 1

The correct answer is b.

Ultraviolet light splits O2 into individual O atoms, and an O atom then combines with an O2 molecule to form O3 (ozone).