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Answer: (2) Hydrated Ferric Oxide
Explanation:
- Iron reacts with oxygen, when exposed to moisture, it forms a chemical substance that is brown in colour and is referred to as rust.
- Rusting is a corrosive process that results in the development of red or orange covering on the outer layer of metals. Rusting mainly happens on surfaces of iron and its alloys.
- Corrosion results in the breakdown of materials due to chemical, electrochemical or some other type of reactions.
- Chemical formula for rust is Fe2O3.xH2O. So rust is hydrated iron (III) oxide.
