If the standard hydrogen electrode is used as the reduction electrode, then the emf is given by__________

a) Ered = -Eo + (5/n ) log10 [H+].
b) Ered = -Eo – (0.0591/n ) log10 [H+].
c) Ered = Eo + (0.0591/n ) log10 [H+].
d) Ered = -Eo + (0.0591/n ) log10 [H+].

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