When iron is exposed to moist air, it gradually rusts. This is due to the formation of?
-
hydrate iron (III) oxide
- anhydrous iron (III) oxide
- anhydrous iron (II) oxide
- hydrate iron (II) oxide
The correct answer is: A
Explanation
Rusting is an oxidation reaction. The iron reacts with water and oxygen to form hydrated iron(III) oxide, which we see as rust.
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