alleryOzone forms in the atmosphere at a height of about:
A40 kilometres
B60 kilometres
C80 kilometres
D20 kilometres
Answer & Solution
Correct answer: D. 20 kilometres
1. It is too reactive to last long at sea level.
2. Higher up, sunlight makes it from atmospheric oxygen.
3. That happens at about 20 kilometres.
_Source: syllabus Chemistry, Chapter 7, The p-Block Elements._
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