8.13 Identify the substance oxidised reduced, oxidising agent and reducing agent for each of the following reactions:
(a) 2AgBr (s) + C6H6O2(aq) → 2Ag(s) + 2HBr (aq) + C6H4O2(aq)
(b) HCHO(l) + 2[Ag (NH3)2]+(aq) + 3OH–(aq) → 2Ag(s) + HCOO–(aq) + 4NH3(aq) + 2H2O(l)
(c) HCHO (l) + 2 Cu2+(aq) + 5 OH–(aq) → Cu2O(s) + HCOO–(aq) + 3H2O(l)
(d) N2H4(l) + 2H2O2(l) → N2(g) + 4H2O(l)
(e) Pb(s) + PbO2(s) + 2H2SO4(aq) → 2PbSO4(s) + 2H2O(l)
(a) Oxidised substance →C6H6O2
Reduced substance → AgBr
Oxidising agent → AgBr
(b) Oxidised substance → HCHO
Reduced substance →[Ag(NH3)2]+
Oxidising agent →[Ag(NH3)2]+
Reducing agent → HCHO
(c) Oxidised substance → HCHO
Reduced substance →Cu2+
Oxidising agent →Cu2+
Reducing agent → HCHO
(d) Oxidised substance →N2H4
Reduced substance →H2O2
Oxidising agent →H2O2
Reducing agent →N2H4
(e) Oxidised substance →Pb
Reduced substance →PbO2
Oxidising agent →PbO2
Reducing agent →Pb
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