Question

During galvanisation, iron metal is given a thin coating of one of the following metals. This metal is:

Options

• chromium

• tin

• zinc

• copper

Answer 1

Zinc

Explanation:

Galvanisation is a sacrificial protection method where iron or steel is coated with a thin layer of zinc. The zinc layer acts as a physical barrier against oxygen and moisture, preventing rust from forming on the underlying iron. Even if the coating is scratched, the zinc corrodes preferentially because it is more reactive than iron, maintaining the protection.