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      Question

      Which French chemist summarised his experiment in 1806,

      and proved that the mass ratio of elements in a chemical compound is always the same, regardless of the source of the compound?
      A Joseph Proust Correct Answer Incorrect Answer
      B Robert Boyle Correct Answer Incorrect Answer
      C Jacob Berzelius Correct Answer Incorrect Answer
      D John Dalton Correct Answer Incorrect Answer

      Solution

      The correct answer is A

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