Multiple choice

Which of the following is/are the main constituents of pearls?

  1. Calcium carbonate
  2. Magnesium carbonate
  3. Sodium carbonate

  1. Only 1

  2. Only 2

  3. Only 1 and 2

  4. Only 2 and 3
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The pearls are mainly composed of calcium and magnesium carbonates.

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