7th Class Science Physical and Chemical Changes Question Bank Physical and Chemical Changes

  • question_answer
    What is the formula of rust?

    A)  \[\text{F}{{\text{e}}_{\text{3}}}{{\text{O}}_{\text{4}}}\]                      

    B)  \[\text{F}{{\text{e}}_{\text{2}}}{{\text{O}}_{\text{3}}}\]

    C)  \[\text{FeO}\]                                    

    D) None of these

    Correct Answer: B

    Solution :

     \[\text{F}{{\text{e}}_{\text{2}}}{{\text{O}}_{\text{3}}}\text{(iron}\,\,\text{oxide)}\]


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