📊 Science
Q. The main constituents of pearls are
  • (A) Calcium Oxide and Ammonium Chloride
  • (B) Calcium Carbonate and Magnesium Carbonate
  • (C) Aragonite and Conchiolin
  • (D) Ammonium Sulphate and Sodium Carbonate
✅ Correct Answer: (B) Calcium Carbonate and Magnesium Carbonate

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Brijesh Goswami
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