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$5.$ Which of the following equations does not count as an oxidation$-$reduction reaction?

$2S{O}_2(g)+O_2(g)2S{O}_3(g)$

$2Na(s)+C{l}_2(g)2$NaCl$(s)$

$4Al(s)+3O_2(g)2A{l}_2{O}_3(s)$

$C{O}_2(g)+H_{2}O(l)H_{2}C{O}_3(aq)$