Multiple choice

Rusting of iron is due to the reaction of iron with ______.

  1. oxygen and cabon dioxide

  2. oxygen and water

  3. cabon dioxide only

  4. oxygen only

  5. carbon dioxide and water
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The mixture of iron with oxygen from water and in the air is what causes rust. When moisture or water meets with iron, oxygen in the water combines with atoms of the iron to form iron oxide. The iron oxide is the reddish coating on the surface which is commonly referred to as rust.

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