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      Question

      What is the chemical formula of rust?

      A FeO Correct Answer Incorrect Answer
      B Fe₂O₃·xH₂O Correct Answer Incorrect Answer
      C FeCO₃ Correct Answer Incorrect Answer
      D FeSOâ‚„ Correct Answer Incorrect Answer

      Solution

      Rust is hydrated iron(III) oxide, which forms when iron reacts with oxygen and moisture.

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