For the redox reaction 2Fe²⁺ + Cl₂ → 2Fe³⁺ + 2Cl^-, which of the following are the correct half-reactions?
I.Cl₂ + 2e^- → 2Cl^-
II.Cl → Cl^- + e^-
III.Cl₂ → 2Cl^- + 2e^-
IV.Fe²⁺ → Fe³⁺ + e^-
V.Fe²⁺ + e^- → Fe³⁺

Question

Quizplus · Accepted Answer

The given redox reaction involves the oxidation of FeS1U1P12 and reduction of ClS1U1B12S1U1B0. 
The half-reaction for oxidation:
FeS1U1P12 → FeS1U1P13 + eS1U1P1-S1S1P0 (IV)
The half-reaction for reduction:
ClS1U1B12S1U1B0 + 2eS1U1P1-S1S1P0 → 2ClS1U1P1-S1S1P0 (I)
Adding both half-reactions, we get the overall reaction as:
2FeS1U1P12 + ClS1U1B12S1U1B0 → 2FeS1U1P13 + 2ClS1U1P1-S1S1P0 
Thus, the correct half-reactions are I and IV.

For the Redox Reaction 2Fe2+ + Cl2 → 2Fe3+

For the Redox Reaction 2Fe²⁺ + Cl₂ → 2Fe³⁺