Essential Chemistry for IGCSE - The Chemical Industry (Section 6 - No. 2)

Which of the following equations correctly represents the reaction in which limestone decomposes?
CaCO3 + H2O -> Ca(OH)2 + CO2
CaCO3 -> CaO + CO2
CaO + CO2 -> CaCO3
Ca(OH)2 -> CaO + H2O

Explanation

Limestone (CaCO3) decomposes into calcium oxide (CaO) and carbon dioxide (CO2).

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