Why does an oiled iron object rust less?
Answer and explanation
Correct answer: The oil layer prevents iron from contacting oxygen and moisture
Rusting is an electrochemical corrosion process that needs iron, oxygen and water or moisture. The oil coating acts as a physical barrier, so air and moisture cannot easily reach the iron surface; consequently, the corrosion reaction becomes slower. Oil does not change iron into another metal, dissolve rust completely, or increase oxidation. Therefore, option A gives the correct prevention mechanism.
Frequently asked questions
What is the correct answer to this question?
The oil layer prevents iron from contacting oxygen and moisture
Why is this the correct answer?
Rusting is an electrochemical corrosion process that needs iron, oxygen and water or moisture. The oil coating acts as a physical barrier, so air and moisture cannot easily reach the iron surface; consequently, the corrosion reaction becomes slower. Oil does not change iron into another metal, dissolve rust completely, or increase oxidation. Therefore, option A gives the correct prevention mechanism.
Which subject and chapter does this question cover?
This is a Class 10 Science question. Chapter: Chemical Substances – Nature and Behaviour. Topic: Chemical Reactions and Equations.
