Solution:
Rust is an oxide of iron.When iron reacts with moisture, it forms oxides with the oxygen in the air. A flaky substance above iron is formed. Rusting is prevented if zinc is coated above it. Rust is formed on an iron surface when it is exposed to moisture present in air. It is a slow and time taking process. Iron reacts with oxygen and forms iron oxide. Coating zinc above the iron is known as galvanisation to prevent it from rusting. It is a process where it forms a barrier that prevents corrosive substances from reaching the steel or iron.
Reaction involved in rusting of iron:
