The main constituents of pearls are?
Question
The main constituents of pearls are?
Options
Option A
aragonite and conchiolin
Option B
calcium oxide and ammonium chloride
Option C
ammonium sulphate and sodium carbonate
Option D
calcium carbonate and magnesium carbonate
Correct Option
Option D
Explanation
The chief component of the nacre that constitutes the pearl is aragonite (CaCO3). Nacre also contains a small amount of conchiolin, a horn like organic substance (albuminoid) that is the main constituent of the mollusk's outer shell.
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