Question
Class 11ChemistryRedox Reactions

Write the half reactions for the following redox reactions:

(a) 2Fe3+(aq) + 2I(aq) ⟶ 2Fe2+(aq) + I2(aq)

(b) Zn(s) + 2H+(aq) ⟶ Zn2+(aq) + H2(g)

(c) Al(s) + 3Ag+(aq) ⟶ Al3+(aq) + 3Ag(s)

Verified Answer

(a) 2I(aq) ⟶ I2(aq) + 2e   … Oxidation
       Fe3+(aq) + e ⟶ Fe2+(aq) [×2]   … Reduction
      2Fe3+(aq)+2I(aq)⟶2Fe2+(aq)+I2(aq)  … Overall redox reac.

(b) Zn(s) ⟶ Zn2+(aq) + 2e   … Oxidation
       2H+(aq) + 2e ⟶ H2(g)   … Reduction
       Zn(s) + 2H+(aq) ⟶ Zn2+(aq) + H2(g)   … Overall redox reaction

(c) Al(s) ⟶ Al3+(aq) + 3e   … Oxidation
      Ag+(aq) + e ⟶ Ag(s) [×3]   … Reduction
      Al(s) + 3Ag+(aq) ⟶ Al3+(aq) + 3Ag(s) … Overall redox reaction