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  1. The main constituents of pearls are

    2. A.

     Calcium Oxide and Ammonium Chloride
    B.

     Calcium Carbonate and Magnesium Carbonate
    C.

     Aragonite and Conchiolin
    D.

     Ammonium Sulphate and Sodium Carbonate

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    Answer : Option B

    Explanation :

    Calcium Carbonate and Magnesium Carbonate.

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