What conditions are required for rusting to take place?
A
Water only
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B
Oxygen only
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C
Water and oxygen
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D
Water and carbon dioxide
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Solution
The correct option is C Water and oxygen
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. It is the common term for corrosion of iron and its alloys, such as steel. Both water and oxygen are required to form rust from metal iron.