Why can rusting start when the paint layer on iron is scratched?
Answer and explanation
Correct answer: The exposed iron surface comes into contact with oxygen in air and moisture
Paint forms a protective barrier between iron and air and moisture. When the layer is scratched, the exposed iron can contact oxygen and water, so oxidation begins and rust may form. The scratch itself does not produce rust; it removes the protective coating and allows the required conditions. Exam tip: Remember that rusting needs both oxygen and moisture.
Frequently asked questions
What is the correct answer to this question?
The exposed iron surface comes into contact with oxygen in air and moisture
Why is this the correct answer?
Paint forms a protective barrier between iron and air and moisture. When the layer is scratched, the exposed iron can contact oxygen and water, so oxidation begins and rust may form. The scratch itself does not produce rust; it removes the protective coating and allows the required conditions. Exam tip: Remember that rusting needs both oxygen and moisture.
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.
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