In the redox reaction: 4 Cr + 3 O₂ + 12 HBr $\rightarrow$ 4 CrBr₃ + 6 H₂O the change in oxidation number for O is from ________.

Name: In the redox reaction: 4 Cr + 3 O 2 + 12 HBr $\rightarrow$ 4 CrBr 3 + 6 H 2 O the change in oxidation number for O is from ________.
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In the given reaction, oxygen starts in O2 (with an oxidation state of 0, as it is in its elemental form) and ends up in H2O, where its oxidation state is -2 (each oxygen atom gains two electrons when it forms water).

In the Redox Reaction: 4 Cr + 3 O2 →\rightarrow→ 4 CrBr3 + 6 H2O the Change in Oxidation Number

In the Redox Reaction: 4 Cr + 3 O₂ $\rightarrow$ 4 CrBr₃ + 6 H₂O the Change in Oxidation Number