please answer all these questions fully $w.s.5*2$

Oxidation Numbers

Which of the following reactions involve oxidation and reduction?

Identify the elements oxidized and reduced.

Identify the oxidizing and reducing agents.

$-34(+1)+1+43(-2),-33(+1),2(+1)-2+42(-2)$

$N{H}_{4}HC{O}_3(s)N{H}_3(g)+H_2{O}_{(g)}+C{O}_2(g)$ no changes

$C{O}_{(g)}^{(C{O}_3{)}^{2-}}{H}_2{O}_{(g)}C{O}_2(g)+H_2(g),C(+2*+4)$ Oxiclizaten $,$ RA

$+2-2(g)+2(H)-2g(g)C{O}_2(g)+H_2(g),H(+10)$ Reduction, OA

$H{g}_{2}C{l}_2($s$)+2N{H}_{3(aq)}H{g}_0(l)+HgN{H}_{2}Cl(s)+N{H}_{4}Cl(aq)$

to $0$