What are the necessary conditions for rust formation?

Presence of air

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Presence of water

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Presence of carbon dioxide gas

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Presence of nitrogen gas

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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 reddish brown residue is formed on the surface of the iron over a period of time, which is called rust. The presence of air and water is a must for the formation of this reddish brown residue.

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