Iron rust is_________________?
Correct answer: B. Hydrated ferric oxide
- A. Ferrous oxide
- B. Hydrated ferric oxide
- C. Powdered iron
- D. Ferric sulphide
Explanation
Ordinary iron rust is mainly hydrated ferric oxide, often represented approximately as Fe₂O₃·xH₂O. The water content varies, so rust is not a single fixed compound such as ferrous oxide.
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