Question : Which among the following is the primary constituent of pearls?
Option 1: Calcium sulphate
Option 2: Calcium carbonate
Option 3: Sodium bicarbonate
Option 4: Magnesium peroxide
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Correct Answer: Calcium carbonate
Solution : The correct answer is Calcium carbonate.
The primary constituent of pearls is calcium carbonate. Pearls are formed within the soft tissue of a living shelled mollusc, such as an oyster or mussel, as a defence mechanism against irritants. The mollusc secretes layers of nacre (mother-of-pearl), primarily composed of calcium carbonate, around the irritant, resulting in the formation of a pearl.
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