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Oxidation number and oxidation state are terms that are:

AQuite unrelated
BOpposite in sense
CInterchangeable
DContradictory
Answer & Solution
Correct answer: C. Interchangeable
1. The oxidation number denotes the oxidation state. 2. The two phrases refer to the same idea. 3. So they are used interchangeably. _Source: syllabus Chemistry Part II, Unit 8, Redox Reactions._
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