Question

The things made up of aluminum develop an Al₂O₃ layer. It acts as a protective layer. But iron oxide layer does not behave like this. Why? Explain

Answer 1

Every metal will form an oxide layer on its metal surface when it is exposed to air
For example iron reacts with oxygen to form iron oxide. For example iron reacts with oxygen to give iron oxide

Similarly aluminium also will react with oxygen to give aluminium oxide.

But other metal oxides will be easily hydrated and will detach from the metal surface

But aluminium oxide cannot be hydrated easily. So it will stick with the metal surface and form a preventive coating. This will avoid further corrosion of metal.