Chemistry
Grade-10
Easy
Question
What two things cause Iron to Rust ?
- Nitrogen and Oxygen
- Water and Carbon dioxide
- Oxygen and Water
- Helium and Air
Hint:
Rusting is due to the presence of moisture in air.
The correct answer is: Oxygen and Water
- Rusting is the phenomenon of forming brown coating on the surface of iron.
- This brown coating is due to formation of iron oxide due to the presence of moisture in air.
4Fe + 3O2 + 2xH2O 
2Fe2O3.xH2O
- It can be prevented by alloying, galvanizing.
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