$1)$ $2\text{CO} + \text{O}_2 \xrightarrow{t^\circ} 2\text{CO}_2$

$2)$ $4\text{CO} + \text{Fe}_3\text{O}_4 \xrightarrow{t^\circ} 3\text{Fe} + 4\text{CO}_2$

$3)$ $2\text{Li} + 2\text{H}_2\text{O} \rightarrow 2\text{LiOH} + \text{H}_2$

$4)$ $\text{Ca} + 2\text{H}_2\text{O} \rightarrow \text{Ca(OH)}_2 + \text{H}_2$

$5)$ $2\text{Al} + 6\text{HCl} \rightarrow 2\text{AlCl}_3 + 3\text{H}_2$

$6)$ $\text{CaCO}_3 + 2\text{HCl} \rightarrow \text{CaCl}_2 + \text{CO}_2 + \text{H}_2\text{O}$

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