The chemistry of corrosion of iron is essentially an electrochemical phenomenon. Explain the reactio:rs occurring during the corrosion of iron in the atmosphere.

Explanation

### Step-by-Step Solution:

1. **Understanding Corrosion**:
Corrosion of iron is primarily an electrochemical process that occurs when iron reacts with moisture and oxygen in the atmosphere. This process leads to the formation of rust, which is primarily composed of iron oxides.

2. **Formation of Acid**:
When water vapor in the atmosphere comes into contact with carbon dioxide (CO2), it forms carbonic acid (H2CO3):
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