i) is a natural process in which a refined metal is converted to a more chemically stable form, such as oxide, hydroxide, or sulphide.

ii) The term we use to describe red iron oxides produced when ferrous metals corrode is known as

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Detailed Solution

Concept: A refined metal is transformed naturally by corrosion into a more stable chemical state, such as oxide, hydroxide, or sulphide. Rust is the name we give to the red iron oxides formed when ferrous metals corrode. The name is hydrated iron(III) oxide is known as rust.
The chemical formula of rust is

.
Both corrosion and rusting are oxidation reactions. While rusting exclusively affects iron, corrosion affects a much wider spectrum of materials. Due to the prevalence of rusting of iron things, we might argue that rusting is a type of corrosion or the most prevalent example of corrosion.
Hence, the answers are corrosion and rusting respectively.

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