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What is corroison? What are the factors ...

What is corroison? What are the factors which affect corrosion? `CO_(2)` is always present in natural water. Explain its effect (increases stops or no effect) on rusting of Fe.

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Corroison is process in which metal reacts with substances present in atmosphere to form surface compounds. Air moisture, presence of `CO_(2)` are factors which affect corrosion. `CO_(2)` increase rusting of iron because greater the number of `H^(+)` ions faster rusting will take place.
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