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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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