Balance the reaction. a coefficient of "1" is understood. choose option "blank" for the correct answer if the coefficient is "1." al + o2 → al2o3

Balanced chemical reaction: 4Al + 3O₂→ 2Al₂O₃.

a) Oxidation half-reaction: Al⁰ → Al⁺³ + 3e⁻ /×4; 4Al⁰ → 4Al⁺³ + 12e⁻.

b) Reduction half-reaction: 4e⁻ + O₂ → 2O⁻² /×3; 12e⁻ + 3O₂ → 6O⁻².

Oxidation is increase of oxidation number, aluminium change oxidation number from zero to +3 and reduction is decrease of oxidation number, oxygen from 0 to -2.

can you attach the