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The reaction 3ClO-(aq) -> ClO3-(aq) + 2Cl-(aq) is best classified as a:

1. Oxidation reaction
2. Reduction reaction
3. Disproportionation reaction
4. Decomposition reaction

Correct answer: Disproportionation reaction

Solution

In ClO-, chlorine is +1. In the products it goes to +5 (ClO3-) and -1 (Cl-). The same element in a single oxidation state (+1) is both oxidized (to +5) and reduced (to -1), which is the definition of disproportionation.

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