Multiple choice

What is the formula for ozone?

  1. O

  2. O2

  3. O3

  4. O4
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Ozone is a molecule composed of three oxygen atoms (O3). It differs from the normal oxygen we breathe (O2, dioxygen) and is formed when UV radiation splits O2 molecules and they recombine with other oxygen atoms. O and O4 are not stable forms of oxygen in normal conditions.

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