Chemistry 0620 · IGCSE · Physical and chemical changes

Physical and chemical changes — practice question

Two reactions, M and N, each produce carbon dioxide. $\mathrm{CaCO_3} \xrightarrow{M} \mathrm{CO_2}$ and $\mathrm{CH_4} \xrightarrow{N} \mathrm{CO_2}$. Which kinds of reaction are M and N?

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