Question

(a) Why is that aluminium which is more reactive than iron does not corrode like iron?
(b) How is corrosion of iron prevented by coating it with a layer of oil?

Answer 1

Explanation:

because aluminum already coated

Answer 2

Explanation:

a) Although Aluminum is more reactive than iron, yet it doesn't corrode like iron. The reason being that when aluminum reacts with moist air, its surface is coated with a thin impervious layer of aluminum oxide which protects the metal underneath from further damage. In contrast, iron when exposes to moist air, is covered with a brown flasky substance called rust. Rust slowly falls from the surface exposing fresh surface for rusting . Thus, corrosion of iron is a continuous process which ultimately eats up the whole iron object.

b) Corrosion of iron is preventing by coating it with a layer of oil. The reason being that the layer of oil doesn't allow air and water to reach the surface of iron .