Question

Which of the following conditions are required for rusting to take place?

• A. Oxygen only
• B. Water only
• C. Water and oxygen both
• D. Water and carbon dioxide

Answer 1

The correct option is C Water and oxygen both

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 a common term for corrosion of iron.
The chemical name of rust is hydrated iron oxide $(F{e}_2{O}_3.x{H}_{2}O)$.