Ncert Exercises & Solutions

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)

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

(e) Pb(s) + PbO2(s) + 2H2SO4(aq) → 2PbSO4(s) + 2H2O(l)

(a) Oxidised substance $\to C_{6} H_{6} O_{2}$

Reduced substance $\to AgBr$

Oxidising agent $\to AgBr$

(b) Oxidised substance $\to HCHO$

Reduced substance $\to {[Ag {({NH}_{3})}_{2}]}^{+}$

Oxidising agent $\to {[Ag {({NH}_{3})}_{2}]}^{+}$

Reducing agent $\to HCHO$

Reduced substance $\to {Cu}^{2 +}$

Oxidising agent $\to {Cu}^{2 +}$

Reducing agent $\to HCHO$

(d) Oxidised substance $\to N_{2} H_{4}$

Reduced substance $\to H_{2} O_{2}$

Oxidising agent $\to H_{2} O_{2}$

Reducing agent $\to N_{2} H_{4}$

(e) Oxidised substance $\to Pb$

Reduced substance $\to {PbO}_{2}$

Oxidising agent $\to {PbO}_{2}$

Reducing agent $\to Pb$