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    Question

    The relative abundance of two isotope of atomic weight

    85 and 87 is 75% and 25% respectively. The average atomic weight of the element is-
    A 86.0 Correct Answer Incorrect Answer
    B 75.5 Correct Answer Incorrect Answer
    C 40.0 Correct Answer Incorrect Answer
    D 85.5 Correct Answer Incorrect Answer
    E 90.2 Correct Answer Incorrect Answer

    Solution

    The correct answer is D

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