Question

Ozone is formed in stratosphere by action of ultraviolet radiations on oxygen.

• A. True
• B. False

Answer 1

The correct option is A True

Ozone:

1. The ozone (O₃) molecule is made up of three oxygen atoms.
2. It is formed in the stratosphere when a single oxygen atom combines with a molecule of oxygen i.e. when [O] combines with O₂.
3. An oxygen molecule consisting of two oxygen atoms splits into atomic oxygen in the presence of ultraviolet radiation.
4. The atomic oxygen then combines with another molecule of oxygen to form ozone.
5. The reactions are as follows: UV lightO₂ ---------------> [O] + [O][O] + O₂ ---------->O₃

Final answer: The given statement is true.