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A substance undergoing disproportionation must contain an element with at least how many oxidation states?

AThree
BSeven
CEight
DFour
Answer & Solution
Correct answer: A. Three
1. The element must be able to go both up and down. 2. So it needs a state above and a state below its starting one. 3. That makes at least three oxidation states. _Source: syllabus Chemistry Part II, Unit 8, Redox Reactions._
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