Which half-reaction has the greatest tendency to occur at the anode in an electrochemical cell? i2(aq) + 2e–   2i–(aq)                      e = +0.53 v co3+(aq) + e–   co2+(aq)              e = +1.80 v o2(g) + 4h+(aq) + 4e–   2h2o(l)              e = +1.23 v

Answerthe half-reaction having the greatest tendency to occur at the anode:     i₂(aq) + 2e⁻  ⇄ 2i⁻  ;   e = +0.53 v======oxidation occurs at the anode. we must therefore find the half-reaction with the greatest tendency to oxidize.the given values of e are reduction potentials (the form of the half-reactions are of reduction).the lower the reduction potential, the higher the potential to oxidize. the half-cell with the lowest reduction potential will have the greatest tendency to oxidize at the anode.the half-reaction having the greatest tendency must be    i₂(aq) + 2e⁻  ⇄ 2i⁻    e = +0.53 vbecause its reduction potential is the lowest out of the three.

Crust,mantle,core,earth