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  3. 9th Class
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9th Class Science Sample Paper Science Olympiad Model Test Paper-1

  • question_answer
    Copper consists of two isotopes \[{}^{63}Cu\](relative abundance 69 %) and \[{}^{65}Cu\](relative abundance 31%). Calculate the relative atomic mass of copper.

    A)  63.62  

    B)  87.30

    C)  45.23  

    D)  56.20

    E)  None of these

    Correct Answer: A

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