O₂(g)+ 4 H⁺(aq)+ 4 E^- → 2 H₂O(l)E° = +1

question 68

Multiple Choice

O₂(g) + 4 H⁺(aq) + 4 e^- → 2 H₂O(l) E° = +1.23 V Pb²⁺(aq) + 2 e^- → Pb(s) E° = -0.13 V
2 H₂O(l) + 2 e^- → H₂(g) + 2 OH^-(aq) E° = -0.83 V
Based on the half-reactions above,electrolysis of an aqueous solution of Pb(NO₃) ₂ is expected to produce.

• A)Pb at the cathode and H₂ at the anode.
• B)Pb at the cathode and O₂ at the anode.
• C)H₂ at the cathode and Pb at the anode.
• D)O₂ at the cathode and Pb at the anode.

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