Question

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

(a) 2AgBr () + C6H6O2(aq) → 2Ag() + 2HBr (aq) + C6H4O2(aq)

(b) HCHO(l) + 2[Ag (NH3)2] +(aq) + 3OH– (aq) → 2Ag(*) + HCOO– (aq) + 4NH3(aq) + 2H2O(l)

(c) HCHO(l) + 2Cu2(aq) + 5OH– (aq) → Cu2O(*) + HCOO– (aq) + 3H2O(l)

(d) N2H4(l) + 2H2O2(l) → N2(g) + 4H2O(l)

(e) Pb() + PbO2() + 2H2SO4(aq) → 2PbSO4(*) + 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