Which metal is protected by a layer of its own oxide?

A
Al
B
Ag
C
In
D
Fe

Solution:

Aluminum forms a thin layer of its own oxide on its surface when reacts with atmospheric oxygen.

$4 Al + 3 O_{2} \to 2 {Al}_{2} O_{3}$

This layer acts as a protective barrier on the surface of the metal, which increases its durability, protects the aluminum from reacting with other metals, and increases its resistance against corrosion.

Solution:

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