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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 FeSO₄ Correct Answer Incorrect Answer

    Solution

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

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