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The classical definition of oxidation looked at oxygen and:

ASulphur
BHydrogen
CCarbon
DNitrogen
Answer & Solution
Correct answer: B. Hydrogen
1. Two elements featured in the early definitions. 2. Adding one or removing the other counted as oxidation. 3. They were oxygen and hydrogen. _Source: syllabus Chemistry Part II, Unit 8, Redox Reactions._
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