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When iron is exposed to moist air, it gradually rusts. This is due to the...

Chemistry
JAMB 2010

When iron is exposed to moist air, it gradually rusts. This is due to the formation of?

  • A. hydrate iron (III) oxide
  • B. anhydrous iron (III) oxide
  • C. anhydrous iron (II) oxide
  • D. hydrate iron (II) oxide
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Correct Answer: Option 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.

There is an explanation video available below.

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Explanation Video

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