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Which of the following is the primary constituent of a pearl?
1. Potassium sulfate
2. Calcium sulfate 
3. Calcium peroxide 
4. Sodium Sulphate
5. Calcium carbonate 

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Correct Answer - Option 5 : Calcium carbonate 

The correct answer is Calcium Carbonate.

  • The chief component of the nacre that constitutes the pearl is aragonite (CaCO3).
  • Nacre also contains a small amount of conchiolin, a hornlike organic substance (albuminoid) that is the main constituent of the mollusc's outer shell.
  • Pearl also contains Magnesium Carbonate(MgCO3) along with Calcium Carbonate.
  • Calcium carbonate is a common substance found in rocks as the minerals calcite and aragonite and is the main component of eggshells, snail shells, seashells, and pearls. 
  • The Molar Mass of Calcium Carbonate is 100.0869 g/mol.
  • Melting point: 825 °C.

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