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Which pair is most essential for rusting of iron?

Answer and explanation

Correct answer: Oxygen and moisture

Iron rusts only when both oxygen and water (moisture) are available. Moisture acts as a medium for the electrochemical reaction, while oxygen participates in the oxidation of iron. The product is hydrated iron(III) oxide, called rust. Option C contains oxygen but lacks the necessary moisture in dry air, so rusting does not occur. Exam tip: Painting, oiling, or greasing prevents rust by blocking air and moisture from reaching iron.

Related tags

Class 10 ScienceChemical ReactionsRusting Of IronCorrosionOxygen And Moisture

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