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Q66 (CDS-II/2026) Science & Technology › Basic Science (Physics, Chemistry, Biology)

Which of the following are the forms of calcium carbonate ?
1. Marble
2. Chalk
3. Limestone
Select the answer using the code given below :

Result
Your answer: —  ·  Correct: D

Explanation

Calcium carbonate (CaCO3) is a chemical compound that occurs naturally in several mineral and rock forms. Limestone is a sedimentary rock composed mainly of calcium carbonate. Chalk is a soft, white, porous, sedimentary form of limestone. Marble is a metamorphic rock that forms when limestone is subjected to high heat and pressure, causing the calcium carbonate to recrystallize. Chemically, all three are primarily composed of CaCO3. Other natural forms include shells of marine organisms and eggshells. Therefore, all three options provided are correct forms of calcium carbonate.

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