engineering chemistry MCQ #2791

For a cell reaction: Zn + Cu²⁺ → Zn²⁺ + Cu, E°cell = 1.1 V. What is the equilibrium constant (Kc) at 25°C?

engineering chemistry MCQ #2791

  1. Question 1

    Q1. For a cell reaction: Zn + Cu²⁺ → Zn²⁺ + Cu, E°cell = 1.1 V. What is the equilibrium constant (Kc) at 25°C?

    • A) 1.6 × 10³⁷
    • B) 1.6 × 10¹⁷
    • C) 1.6 × 10⁵⁷
    • D) 1.6 × 10⁷⁷

    Answer: 1.6 × 10³⁷

    Explanation: E°cell = (0.059/n) * log Kc, rearranging gives log Kc = (n * E°cell) / 0.059. For n = 2, log Kc = 37.288, so Kc = 1.94 × 10³⁷ ≈ 1.6 × 10³⁷ (approx.).