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JEE Main & Advanced Sample Paper JEE Main Sample Paper-39

  • question_answer
    The relative abundance of two isotopes of atomic weight 85 and 87 is 75% and 25% respectively. The average atomic weight of element is

    A)  75.5                           

    B)  85.5

    C)  40.0                           

    D)  86.0

    Correct Answer: B

    Solution :

     Average atomic weight \[=85\left( \frac{75}{100} \right)+87\left( \frac{25}{100} \right)=85.5.\]


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