Multiple choice

Which chemical compound is mainly found in pearl secreted by molluses?

  1. Sodium hydroxide

  2. Sodium carbonate

  3. Potassium carbonate

  4. Calcium carbonate
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Pearls are primarily composed of calcium carbonate (in the form of aragonite or calcite) deposited in concentric layers.

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