Q1.Given the standard electrode potentials: Fe²⁺(aq) + 2e⁻ → Fe(s); E° = -0.44 V Zn²⁺(aq) + 2e⁻ → Zn(s); E° = -0.76 V Cu²⁺(aq) + 2e⁻ → Cu(s); E° = +0.34 V Ag⁺(aq) + e⁻ → Ag(s); E° = +0.80 V Which of the following reactions is NOT spontaneous?