when iron is exposed to atmospheric gasesand water vapour it forms a
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Reaction of iron with air
Iron metal reacts in moist air by oxidation to give a hydrated iron oxide. This does not protect the iron surface to further reaction since it flakes off, exposing more iron metal to oxidation. This process is called rusting and is familiar to any car owner.
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Rust
Explanation:
- Rust is an iron oxide mostly reddish brown in colour, formed when iron and oxygen react in the present of moisture available in air.
- This reaction is known as redox reaction.
- Rust can be seen on the surface of iron objects when they are exposed to atmospheric gases.
- Rusting makes the iron objects weak and it loses strength, permeability and appearance.
- It can be prevented by applying oil, grease or paint on the surface.
Learn More:
What is redox reaction? Give two examples of redox reactions.
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