Rust is an example of which process?

• A. Corrosion
• B. Combustible
• C. Ionic charge
• D. Group

Answer: (A)

Rust is a chemical process called corrosion. It happens when iron reacts with oxygen in the presence of water, forming iron oxide. This is an oxidation-reduction reaction: iron loses electrons to oxygen, with water helping move ions and accelerate the reaction. It’s not combustion (burning), nor is it about ionic charge or a group in the periodic table. Thinking of rust as corrosion explains why metal exposed to moisture and air gradually degrades and how coatings or protective layers help prevent it.