alleryCorrosion of iron involves which type of reaction?
AElectrochemical: Fe oxidized to Fe³⁺, O2 reduced
BOxidation only
CReduction only
DAcid neutralization
Answer & Solution
Correct answer: A. Electrochemical: Fe oxidized to Fe³⁺, O2 reduced
Rusting is essentially an electrochemical process: Fe
→ Fe²⁺ + 2e⁻ (anodic, oxidation).
O2 + 2H2O + 4e⁻ → 4OH⁻ (cathodic, reduction).
Fe²⁺ further oxidizes to Fe³⁺, eventually forming hydrated Fe2O3 (rust).
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