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Question
Which of the following represents the chemical formula of calcium carbonate?
Options:
A .  CaCO3
B .  Ca2CO3​
C .  Ca(CO3)2
D .  Ca3CO2​
Answer: Option A
:
A
Calcium carbonate consist of calcium ion and carbonate ion, i.e.,Ca2+and CO32, which have a charge of +2 and -2 respectively.
SymbolCaCO3Charge+2-2
On cross-multiplication and balancing the charge, we get the formula as CaCO3.

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