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Question

What are the essential conditions for rusting to take place?

A
Presence of pure water
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B
Presence of oxygen
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C
Presence of water
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D
Presence of oxygen alone is enough
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Solution

The correct options are
B Presence of oxygen
C Presence of water
Rust is a general term for a series of iron oxides, usually, red oxides, formed by the reaction of iron with oxygen in the presence of water or air moisture.
So the presence of impure water and oxygen are required to form rust from metal iron.
Options B, C are correct.

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