Multiple choice general knowledge science & technology

What is calcium carbonate normally known as?

  1. Chalk

  2. Coal

  3. Lignite

  4. Silica
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A Correct answer
Explanation

Calcium carbonate (CaCO3) is the chemical composition of chalk, a soft white limestone used in writing and drawing. Coal and lignite are carbon-based fuels, while silica is silicon dioxide (SiO2) - none of these match calcium carbonate's composition.

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