Why is chemical equation is calcium carbonate and marble the same?

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Solution

The formula for Limestone, Marble and Chalk is same ,i.e., CaCO3 All of them are a form of calcium carbonate.

Chemically there is no difference in them but they differ in their physical structure.

Marble has a hard crystalline structure while Chalk is amorphous in nature. But limestone is a sedimentary rock which can occur in both crystalline and amorphous form.

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Balance the following chemical equation

Calcium hydroxide + carbon dioxide -calcium carbonate + water

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If the chemical composition of marble and chalk is the same then why area they different physically?

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