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Question

Which of the following are the forms of calcium carbonate?
1. Marble
2. Chalk
3. Limestone
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This question was previously asked in
CDS 2 2026 Maths Question Paper (13-Sep-2026)
The correct answer is

1, 2 and 3

Marble, chalk, and limestone are all naturally occurring forms of calcium carbonate (CaCO3), differing mainly in their degree of crystallinity, purity, and geological formation process.

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