Chemistryhard · Past Paper
What type of reaction is the formation of ozone ($O_3$) from oxygen ($O_2$) in the upper atmosphere?
AExothermic
BPhotochemical
CCombustion
DDisplacement
✓ Correct Answer: B — Photochemical
Ozone is formed when UV light from the sun splits oxygen molecules, making it a photochemical reaction.
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