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

  • question_answer
    Why is the rusting of iron grouped under a chemical change?

    A)  It changes its colour.

    B)  It becomes powdery.

    C)  A new substance is formed.

    D)  It changes its shape.

    Correct Answer: C

    Solution :

    Rust (Iron oxide) is a substance that has properties which are different from both iron and oxygen. So, a new substance is formed.


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