ons: Cr₂O₇²⁻, MnO₄⁻, ClO₃⁻, and BrO⁻. Determine which statement is true. A. The oxidation number of bromine is -1. B. The oxidation number of manganese is +2. C. The oxidation number of oxygen is -2. D. The oxidation number of chlorine is +7. E. The oxidation number of chromium is +3.

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