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      Question

      What was the achievement of Dobereiner’s

      triads?
      A First attempt to study the size of atoms. Correct Answer Incorrect Answer
      B First attempt to relate the properties of elements with atomic mass. Correct Answer Incorrect Answer
      C First attempt to study the colour of elements. Correct Answer Incorrect Answer
      D First attempt to study the atomicity of molecules. Correct Answer Incorrect Answer

      Solution

      The correct answer is B

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