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metal oxide and carbon dioxide

Na2CO3(s) + heat -----> Na2O(s) + CO2(g) [not decomposed in normal conditions as Na2CO3 is very stable]

MgCO3(s) + heat -----> MgO(s) + CO2(g)

CoCO3(s) + heat -----> CoO(s) + CO2(g)

CuCO3(s) + heat -----> CuO(s) + CO2(g)

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