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)
(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