What is the balanced half‐reaction that occurs at the anode in the unbalanced overall cell reaction of a voltaic cell:
3 MnO4– + 5 Fe (s) → 3 Mn2+ + 5 Fe3+
a) MnO 4- (aq) + 8H (aq) + 5e - → Mn2+ (aq) + 4H 2 O(l)
b) 2MnO 4- (aq) +12H+ (aq) + 6e - → 2Mn2+ (aq) + 3H 2 O(l)
c) Fe(s) → Fe3+ (aq) + 3e -
d) Fe(s) → Fe2+ (aq) + 2e -
e) Fe2+ (s) → Fe3+ (aq) + e -
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