Multiple choice general knowledge science & technology

WHAT IS THE CHEMICAL NAME OF " CHALK " ?

  1. SODIUM CARBONATE

  2. CALCIUM BICARBONATE

  3. SODIUM BICARBONATE

  4. CALCIUM CARBONATE
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Chalk is chemically known as calcium carbonate (CaCO3), a soft white sedimentary rock. Sodium compounds (A, C) are incorrect because chalk contains calcium, not sodium. Calcium bicarbonate (B) is Ca(HCO3)2, which is soluble and chemically distinct from insoluble chalk.

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