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Consider the change in oxidation state of bromine corresponding to different emf values as shown in the diagram below: BrO4⁻ → BrO3⁻ → HBrO Br⁻ → Br2 The species undergoing disproportionation is

1. BrO3⁻
2. BrO4⁻
3. HBrO
4. Br2

Correct answer: BrO3⁻

Solution

Disproportionation occurs when a single species is simultaneously oxidized and reduced. Among the given options, BrO3⁻ can undergo disproportionation to form BrO4⁻ (oxidation) and Br⁻ (reduction).

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