Everyday Science
NULL
Medium
Question
The main constituents of pearls are ______________?
A
Calcium oxide &Ammonium Chloride
B
Calcium Carbonate &Megnesium Carbonate
✓ Official correct answer
C
Aragonite & Conchiolin
D
None of these
Community credibility
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A
Calcium oxide &Ammonium Chloride
No member explanations yet for this option.
B
Calcium Carbonate &Megnesium Carbonate
No member explanations yet for this option.
C
Aragonite & Conchiolin
No member explanations yet for this option.
D
None of these
No member explanations yet for this option.
Explanation
According to the keyed exam answer: calcium carbonate and magnesium carbonate.
Editor note: chemistry of nacre is more precisely CaCO₃ + conchiolin; options left unchanged.
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