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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