Question : Limestone, chalk and marble are different forms of ______.
Option 1: Calcium Phosphate
Option 2: Calcium Hydroxide
Option 3: Calcium Oxide
Option 4: Calcium Carbonate
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Correct Answer: Calcium Carbonate
Solution : The correct answer is Calcium Carbonate.
Limestone, chalk and marble are different forms of Calcium Carbonate (CaCO 3 ) , a chemical compound that occurs in nature. Limestone is a sedimentary rock composed mainly of calcium carbonate. Chalk is a soft, white, porous sedimentary rock that is a form of limestone. Marble is a metamorphic rock that forms from the recrystallization of limestone under high temperature and pressure.
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