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12th Class Chemistry Nuclear Chemistry / नाभिकीय रसायन Question Bank Critical Thinking Nuclear chemistry

  • 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                                                                  [DCE 2003]

    A)            75.5                                          

    B)            85.5

    C)            40.0                                          

    D)            86.0

    Correct Answer: B

    Solution :

               Average atomic weight of element \[=\frac{85\times 3+87\times 1}{3+1}=85.5\]


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