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Redox reactions are involved in phenomena that are physical and also:

AHistorical
BPolitical
CBiological
DAstronomical
Answer & Solution
Correct answer: C. Biological
1. Redox chemistry reaches beyond the laboratory. 2. Living processes depend on it too. 3. So the phenomena are both physical and biological. _Source: syllabus Chemistry Part II, Unit 8, Redox Reactions._
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