Corrosion occurs due to mixture of iron and _______ .

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ALP CBT 2 Fitter Previous Paper: Held on 23 Jan 2019 Shift 2

Answer 1

Explanation:

Corrosion:

It is the process in which metals are eaten up gradually by the action of air, moisture, or a chemical (such as acid) on their surface.
Rusting of iron metal is the most common form of corrosion.
When an iron object is left in damp air for a considerable time, it gets covered with a red-brown flaky substance called 'rust'.
During the corrosion of iron, iron metal is oxidized by the oxygen of air in the presence of water (moisture) to form hydrated iron (III) oxide called rust.
- 4Fe + 3O2 + 2xH2O → 2Fe2O3.xH2O (Hydrated iron (III) oxide)
The rusting of iron is a redox reaction.
Corrosion weakens the iron and steel objects and structures such as railings, car bodies, bridges, and ships and cuts short their life.