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Calcium has valency 2 and carbonate has valency 2. The formula of calcium carbonate is

ACa(CO3)2 directly
BCa2CO3 directly
CCaC2O3 directly
DCaCO3
Answer & Solution
Correct answer: D. CaCO3
1. With equal valencies, criss-cross gives 1:1 ratio. 2. 1 Ca with 1 CO3 gives a neutral formula. 3. So calcium carbonate is CaCO3. 4. It is the main component of marble and limestone. _Source: Selina Concise Chemistry Class 9, Ch 4 The Language of Chemistry (Mistral OCR'd PDF), section on chemical formula_
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