What is the chemical formula of carbonic acid?

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A H2CO3
B CaCO3
C Na2SO4
D HCO2

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Answer: A. H2CO3

Carbonic acid forms when carbon dioxide dissolves in water: CO2 + H2O gives H2CO3. It has two hydrogen atoms, one carbon atom and three oxygen atoms. CaCO3 is calcium carbonate, a salt, not an acid.

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What is the chemical formula of carbonic acid?

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