Rusting of iron is :

Asked in HPPSC HPAS Prelims 2011 · Topic: Metals, Minerals, Ores: Properties, Uses (Corrosion of metals: causes, mechanism (rusting), and prevention methods (galvanization, anodizing, electroplating, alloying, painting))

1. An electrochemical process
2. A photochemical process
3. An electroanalytical process
4. All of the above

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