Question: Given all the equal properties but only exchange current densities that vary, which of the reactions will have the lowest overpotential for a given current

Given all the equal properties but only exchange current densities that vary, which of the reactions will have the lowest overpotential for a given current density:

Group of answer choices

NiOOH +H2O +e- = Ni(OH)2 + OH-

Zn + 2OH- = Zn(OH)2 + 2e-

Fe3+ + e- = Fe2+

H2 = 2H+ + 2e- (on Pt in 1 N HCl)

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