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WAEC - Chemistry (2013 - No. 35)

Consider the redox reaction as represented by the following equation: 12(aq) + 2S2O32-(aq) → 21-(aq) + S4O62-(aq). Which of the species in the equation is reduced?
S4O62-(aq)
S4O32-(aq)
12(aq)
1-(aq)

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