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double displacement reaction of weak acid by strong acid.Since,neutralisation means formation of unionised molecule of water,according to Arrhenius'theory.In this reaction,carbonic acid is formed which loses carbon dioxide at room temperature.Here carbonic acid is displaced by hydrochloric acid.Hence,it is displacement reaction.Its equation is,

CaCO3 + 2HCl -------> CaCl2 + H2CO3

but,H2CO3 loses CO2 at room temperature.Therefore it becomes,

CaCO3 + 2HCl ------->Cacl2 + H2O + CO2

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