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13. What is the reduction half-reaction for the following unbalanced redox equation? Cr2O72+NH4+Cr2O3+N2 a. Cr2O3Cr2O72 b. Cr2O72Cr2O3 c. NHH4+N2 d. N2NH4+ 12. What is the

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13. What is the reduction half-reaction for the following unbalanced redox equation? Cr2O72+NH4+Cr2O3+N2 a. Cr2O3Cr2O72 b. Cr2O72Cr2O3 c. NHH4+N2 d. N2NH4+ 12. What is the coefficient for H+when this half-reaction is balanced? H++MnO2Mn2++H2O a. 1 b. 2 c. 3 d. 4

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