Question

metal which can form a barrier layer of oxide on its surface

Answer 1

aluminum...........

Answer 2

Explanation:

Aluminium is the metal which when exposed to air forms a layer of aluminium oxide on its surface. This layer of oxide provides protection to aluminium as a results, it does not get corroded as long as this oxide layer is stable.

Therefore, we can conclude that this layer of oxide on aluminium's surface acts as a barrier.