What are the necessary conditions for rust formation in Iron?

Presence of air

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Presence of water

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Presence of glass

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Presence of dust

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Solution

The correct options are
A
Presence of air

B
Presence of water

When iron is exposed to moisture and air, a brown residue is formed on the surface of iron over a period of time, which is called rust. Presence of air and water is a must for the formation of this brown residue.

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