Question

Al is more reactive than iron yet there is less corrosion of aluminium as compared to our and when both are exposed to air

Answer 1

Aluminium is highly reactive metal. When aluminium is exposed to air it reacts with oxygen and forms a white thin layer of aluminium oxide on its surface. This layer forms protective coating on aluminium and prevents the reaction of aluminium with oxygen. Aluminium metal with this protective layer is used for making cooking utensils.