WAEC Chemistry 2013 Objective — Question 37

Question 37 of 50 from the West African Examinations Council (WAEC) Chemistry 2013 Objective paper, with the correct answer and a full explanation.

Consider the redox reaction as represented by the following equation: I2(aq) + 2S2O3²⁻(aq) → 2I⁻(aq) + S4O6²⁻(aq). Which of the species in the equation is reduced?

A. S4O6²⁻(aq)
B. S2O3²⁻(aq)
C. I2(aq)Correct
D. I⁻(aq)

Explanation

The oxidation number of iodine changes from 0 in I2 to -1 in I⁻. This is reduction. I2 has been reduced.

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