engineering chemistry MCQ #2770

The standard reduction potential for Cu²⁺/Cu is 0.34 V. The reduction potential at pH = 14 is (Cu²⁺ + 2e⁻ → Cu, E⁰ = 0.34 V)

engineering chemistry MCQ #2770

  1. Question 1

    Q1. The standard reduction potential for Cu²⁺/Cu is 0.34 V. The reduction potential at pH = 14 is (Cu²⁺ + 2e⁻ → Cu, E⁰ = 0.34 V)

    • A) -0.22 V
    • B) 0.34 V
    • C) -0.34 V
    • D) 0.22 V

    Answer: -0.22 V

    Explanation: Using Nernst equation, E = E⁰ - 0.0591 / n log(1 / [Cu²⁺]), at pH 14, [Cu²⁺] is very low due to Cu(OH)₂ formation.