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Which graph represents the reduction potential of O2 (at 1 bar pressure and 25 ºC) as a function of Electrochemistry Chemistry Question

Question

Which graph represents the reduction potential of O2 (at 1 bar pressure and 25 ºC) as a function of pH?
O2(g) + 4 H+(aq) + 4 e–  2 H2O(l) Eº = 1.23 V

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