Why can rusting start when the paint layer on iron gets scratched?
Answer and explanation
Correct answer: The exposed surface comes in contact with air and moisture
Paint protects iron by acting as a barrier against oxygen and water. A scratch breaks that continuous protective layer and exposes fresh iron to air and moisture. Electrochemical oxidation can then begin at the exposed region, producing rust that may spread beneath the coating. Therefore option A is correct. Paint does not generate oxygen, and the other options describe impossible transformations.
Frequently asked questions
What is the correct answer to this question?
The exposed surface comes in contact with air and moisture
Why is this the correct answer?
Paint protects iron by acting as a barrier against oxygen and water. A scratch breaks that continuous protective layer and exposes fresh iron to air and moisture. Electrochemical oxidation can then begin at the exposed region, producing rust that may spread beneath the coating. Therefore option A is correct. Paint does not generate oxygen, and the other options describe impossible transformations.
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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