Chemistry

Chemistry

Problem

The net reaction desired in acidic solution is 2 I−+H2O2+2 H+→I2+2 H2O2\,\text{I}^- + \text{H}_2\text{O}_2 + 2\,\text{H}^+ \rightarrow \text{I}_2 + 2\,\text{H}_2\text{O}. Which pair of balanced half-reactions, when added together, produces the net reaction above? a) (1) 2 I−→I2+2 e−2\,\text{I}^- \rightarrow \text{I}_2+2\,e^- (2) H2O2→O2+2 H++2 e−\text{H}_2\text{O}_2 \rightarrow \text{O}_2+2\,\text{H}^++2\,e^- b) (1) I2+2 e−→2 I−\text{I}_2+2\,e^- \rightarrow 2\,\text{I}^- (2) H2O2+2 H++2 e−→2 H2O\text{H}_2\text{O}_2+2\,\text{H}^+ +2\,e^- \rightarrow 2\,\text{H}_2\text{O} c) (1) I−→12 I2+e−\text{I}^- \rightarrow \dfrac12\,\text{I}_2+e^- (2) H2O2+2 H++2 e−→2 H2O\text{H}_2\text{O}_2+2\,\text{H}^+ +2\,e^- \rightarrow 2\,\text{H}_2\text{O} d) (1) 2 I−→I2+2 e−2\,\text{I}^- \rightarrow \text{I}_2+2\,e^- (2) H2O2+2 e−→2 OH−\text{H}_2\text{O}_2+2\,e^- \rightarrow 2\,\text{OH}^-

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