How does applying oil to iron mainly prevent rusting?
Answer and explanation
Correct answer: Oil forms a protective layer between iron and air and moisture.
Rusting is a corrosion process that needs both oxygen from air and water or moisture at the iron surface. Oil spreads over the metal and forms a continuous protective coating, so air and moisture cannot easily reach the iron. Thus rusting is prevented or greatly slowed. Oil does not chemically change existing rust into iron, increase reactivity, or supply extra oxygen, so option A is correct.
Frequently asked questions
What is the correct answer to this question?
Oil forms a protective layer between iron and air and moisture.
Why is this the correct answer?
Rusting is a corrosion process that needs both oxygen from air and water or moisture at the iron surface. Oil spreads over the metal and forms a continuous protective coating, so air and moisture cannot easily reach the iron. Thus rusting is prevented or greatly slowed. Oil does not chemically change existing rust into iron, increase reactivity, or supply extra oxygen, so option A is correct.
Which subject and chapter does this question cover?
This is a Class 10 Science question. Chapter: Metals and Non-metals. Topic: Reactivity series.
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