Sodium Thiosulfate, Na₂S₂O₃, Is Used as a "Fixer" in Black

Multiple Choice

Sodium thiosulfate, Na₂S₂O₃, is used as a "fixer" in black and white photography. Identify the reducing agent in the reaction of thiosulfate with iodine. 2S₂O₃^2-(aq) + I₂(aq) → S₄O₆^2-(aq) + 2I^-(aq)

A) I ₂( aq)
B) I ⁻( aq)
C) S ₂O ₃ ²⁻( aq)
D) S ₄O ₆ ²⁻( aq)
E) S ₂O ₃ ²⁻( aq) and I ⁻( aq)