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Calcium carbonate is NOT a metal, it is a compound that contains the ion of a metal.

The reaction is not, strictly speaking, neutralisation (since neutralisation reactions make a salt and water as the only products, and this reaction makes carbon dioxide as well) although the acid is neutralised!

The carbonate ions each accept two protons, forming H2CO3, most of which then breaks down to form CO2 and water.

The reaction is exothermic (but only just) so could be called " an exothermic reaction".

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