Chemistry · Electronic concepts of oxidation and reduction, redox reactions, oxidation number, rules for assigning oxidation number and balancing of redox reactions
Iron is not protected from rusting by:
Iron is not protected from rusting by:
- A. galvanization
- B. electroplating with \( N i \) or \( C r \)
- C. heating the iron to redness in steam
- D. treating it with \( H_{3} P O_{4} \)
Step-by-step solution
Heating iron to redness in steam causes a chemical reaction forming iron oxides (rust), so it does not protect against rusting; instead, it promotes oxidation. In contrast, galvanization, electroplating with Ni or Cr, and treatment with H3PO4 all create protective layers that prevent rust.
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