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QUESTION:As shown here, some half-reactions have positive reduction potentials, some have negative reduction potentials, but only one has a potential of 0.00 V. What does a reduction potential of zero indicate about the hydrogen half-reaction?2 H+ (aq) + 2e− → H2 (s): [E° = 0.00 V]Ni2+ (aq) + 2e− → Ni (s): [E° = −0.23 V]Zn2+ (aq) + 2e− → Zn (s): [E° = −0.76 V]Hg2+ (aq) + 2e− → Hg (l): [E° = 0.85 V]ANSWER OPTIONS:[A] : It is always at equilibrium.[B] : Pairing it with another half-reaction prevents all electron transfer.[C] : It was arbitrarily chosen as the reference electrode.[D] : It can never be spontaneous.

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