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What is the chemical reason why an oiled iron object rusts less?

Answer and explanation

Correct answer: Oil reduces contact with air and moisture

Rusting requires electrochemical oxidation of iron in the presence of oxygen and water. A continuous oil film covers the iron and acts as a barrier, reducing the access of humid air to the metal surface. With less oxygen and moisture reaching the iron, the oxidation current and rust formation decrease. Hence option A is correct; oil does not transmute iron, convert rust to water, or increase oxygen supply.

Related tags

ScienceClass10RustingOilingChemical Reactions And EquationsChemical Substances – Nature And BehaviourChemical Substances Nature And BehaviourClass 10 Mcq

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