Identify the substance oxidised,reduced,oxidising agent,and reducing agent for each of the following reactions:
$(a)$ $2 AgBr_{(s)} + C_6 H_6 O_{2(aq)} \rightarrow 2 Ag_{(s)} + 2 HBr_{(aq)} + C_6 H_4 O_{2(aq)}$
$(b)$ $HCHO_{(l)} + 2 [Ag(NH_3)_2]^+_{(aq)} + 3 OH^-_{(aq)}$ $\rightarrow 2 Ag_{(s)} + HCOO^-_{(aq)} + 4 NH_{3(aq)} + 2 H_2 O_{(l)}$
$(c)$ $HCHO_{(l)} + 2 Cu^{2+}_{(aq)} + 5 OH^-_{(aq)} \rightarrow Cu_2 O_{(s)} + HCOO^-_{(aq)} + 3 H_2 O_{(l)}$
$(d)$ $N_2 H_{4(l)} + 2 H_2 O_{2(l)} \rightarrow N_{2(g)} + 4 H_2 O_{(l)}$
$(e)$ $Pb_{(s)} + PbO_{2(s)} + 2 H_2 SO_{4(aq)} \rightarrow 2 PbSO_{4(s)} + 2 H_2 O_{(l)}$
$(a)$ $2 AgBr_{(s)} + C_6 H_6 O_{2(aq)} \rightarrow 2 Ag_{(s)} + 2 HBr_{(aq)} + C_6 H_4 O_{2(aq)}$
$(b)$ $HCHO_{(l)} + 2 [Ag(NH_3)_2]^+_{(aq)} + 3 OH^-_{(aq)}$ $\rightarrow 2 Ag_{(s)} + HCOO^-_{(aq)} + 4 NH_{3(aq)} + 2 H_2 O_{(l)}$
$(c)$ $HCHO_{(l)} + 2 Cu^{2+}_{(aq)} + 5 OH^-_{(aq)} \rightarrow Cu_2 O_{(s)} + HCOO^-_{(aq)} + 3 H_2 O_{(l)}$
$(d)$ $N_2 H_{4(l)} + 2 H_2 O_{2(l)} \rightarrow N_{2(g)} + 4 H_2 O_{(l)}$
$(e)$ $Pb_{(s)} + PbO_{2(s)} + 2 H_2 SO_{4(aq)} \rightarrow 2 PbSO_{4(s)} + 2 H_2 O_{(l)}$
(N/A) Oxidised: $C_6 H_6 O_2$,Reduced: $AgBr$,Oxidising agent: $AgBr$,Reducing agent: $C_6 H_6 O_2$
$(b)$ Oxidised: $HCHO$,Reduced: $[Ag(NH_3)_2]^+$,Oxidising agent: $[Ag(NH_3)_2]^+$,Reducing agent: $HCHO$
$(c)$ Oxidised: $HCHO$,Reduced: $Cu^{2+}$,Oxidising agent: $Cu^{2+}$,Reducing agent: $HCHO$
$(d)$ Oxidised: $N_2 H_4$,Reduced: $H_2 O_2$,Oxidising agent: $H_2 O_2$,Reducing agent: $N_2 H_4$
$(e)$ Oxidised: $Pb$,Reduced: $PbO_2$,Oxidising agent: $PbO_2$,Reducing agent: $Pb$
$(b)$ Oxidised: $HCHO$,Reduced: $[Ag(NH_3)_2]^+$,Oxidising agent: $[Ag(NH_3)_2]^+$,Reducing agent: $HCHO$
$(c)$ Oxidised: $HCHO$,Reduced: $Cu^{2+}$,Oxidising agent: $Cu^{2+}$,Reducing agent: $HCHO$
$(d)$ Oxidised: $N_2 H_4$,Reduced: $H_2 O_2$,Oxidising agent: $H_2 O_2$,Reducing agent: $N_2 H_4$
$(e)$ Oxidised: $Pb$,Reduced: $PbO_2$,Oxidising agent: $PbO_2$,Reducing agent: $Pb$
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