Which of the following reactions would require the use of an inert electrode?
1. Zn(s) + 2Fe³⁺ (aq) → Zn²⁺ (aq) + 2Fe²⁺ (aq)
2. Zn(s) + 2Ag⁺ (aq) → Zn²⁺ (aq) + 2Ag(s)
3. 3Cu(s) + 2Au³⁺ (aq) → 3Cu²⁺ (aq) + 2Au (s)
4. Cl2(g) + 2I⁻ (aq) → 2Cl⁻ (aq) + I2 (aq) A) 1 only
B) 1 and 3 only
C) 2 and 3 only
D) 1 and 4 only
E) 3 and 4 only
