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Dioxygen makes up roughly what share of the atmosphere?

AAbout 80 per cent
BAbout 20 per cent
CAbout 40 per cent
DAbout 60 per cent
Answer & Solution
Correct answer: B. About 20 per cent
1. Air contains a fixed share of oxygen gas. 2. That share is enough for many elements to combine with it. 3. It is about 20 per cent. _Source: syllabus Chemistry Part II, Unit 8, Redox Reactions._
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