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

Question 22

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. 2S2O32¯(aq) + I2(aq) →\rightarrow S4O62¯(aq) + 2I¯(aq)


A) I2(aq)
B) I¯(aq)
C) S2O32¯(aq)
D) S4O62¯(aq)
E) S2O32¯(aq) and I¯(aq)

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