Ca→cao→caco3→ca(hco3) 2→caco3→cao→cacl2→ca

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The chemical reaction stated appears to be a process of calcium (Ca) reacting with different compounds to form calcium compounds. Here is the breakdown of the reaction steps:

Ca → Formation of Calcium Oxide (CaO)CaO + CO2 → Formation of Calcium Carbonate (CaCO3)CaCO3 → Decomposition into CaO and CO2CaO + H2CO3 → Formation of Calcium Bicarbonate (Ca(HCO3)2)Ca(HCO3)2 → Decomposition into CaCO3 and CO2CaCO3 → Decomposition into CaO and CO2CaO + 2HCl → Formation of Calcium Chloride (CaCl2) and H2OCaCl2 → Formation of Calcium (Ca)

This sequence represents a series of reactions involving calcium and various compounds that lead to the formation of calcium compounds.