Question

Identify the substance oxidised, reduced, oxidising agent and reducing agent for each of the following reactions: 

(a) 2AgBr _(s) + C₆H₆O_2(aq) → 2Ag_(s) + 2HBr _(aq) + C₆H₄O_2(aq) 

(b) HCHO_(l) + 2[Ag (NH₃)₂] +_(aq) + 3OH^– _(aq) → 2Ag_(s) + HCOO^– _(aq) + 4NH_3(aq) + 2H₂O_(l) 

(c) HCHO_(l) + 2Cu_2(aq) + 5OH^– _(aq) → Cu₂O(s) + HCOO^– _(aq) + 3H₂O_(l) 

(d) N₂H_4(l) + 2H₂O_2(l) → N_2(g) + 4H₂O_(l) 

(e) Pb_(s) + PbO_2(s) + 2H₂SO_4(aq) → 2PbSO_4(s) + 2H₂O_(l)  

Answer 1

(a) Oxidised substance → C₆H₆O₂ 

Reduced substance → AgBrO

xidising agent → AgBr 

Reducing agent → C₆H₆O₂ 

(b)Oxidised substance → HCHO 

Reduced [Ag(NH₃)₂]⁺ substance → 

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