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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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