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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.

Related tags

ScienceClass10RustingCorrosion-ProtectionChemical Reactions And EquationsChemical Substances – Nature And BehaviourChemical Substances Nature And BehaviourClass 10 Mcq

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