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      Question

      The main constituents of pearls

      are:
      A Calcium carbonate & magnesium carbonate Correct Answer Incorrect Answer
      B Calcium oxide & ammonium chloride Correct Answer Incorrect Answer
      C Aragonite & sodium carbonate Correct Answer Incorrect Answer
      D Ammonium sulfate & sodium carbonate Correct Answer Incorrect Answer

      Solution

      The correct answer is A

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