corrosion

Question

Rusting of iron is an example of:

RankGuru · Accepted Answer

**Rusting** is an electrochemical phenomenon occurring in the presence of water and oxygen.
- **Mechanism**:
1. **Anodic region**: Iron is oxidized to ferrous ions.
   $2Fe(s) 	o 2Fe^{2+} + 4e^-$ (Oxidation)
2. **Cathodic region**: Oxygen is reduced in the presence of $H^+$ (from $CO_2 + H_2O 	o H_2CO_3$).
   $O_2(g) + 4H^+ + 4e^- 	o 2H_2O(l)$ (Reduction)
- The ferrous ions are further oxidized by atmospheric oxygen to form hydrated ferric oxide ($Fe_2O_3 \cdot xH_2O$), which is **Rust**. Since both oxidation and reduction occur, it is a **Redox Reaction**.

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More corrosion Practice Questions

Rusting of iron in moist air is electrochemical because: