Balancing Redox Reactions in Acidic Solution

What is the oxidation number of oxygen in H2O2?

• -1

• 2

• 4

• 0

Balance the following redox reaction in acidic solution: MnO4- + H2O2 -> Mn2+ + O2

• 2MnO4- + 4H2O2 -> 2Mn2+ + 4O2 + 4H2O

• 2MnO4- + 6H2O2 -> 2Mn2+ + 3O2 + 4H2O

• MnO4- + 2H2O2 -> Mn2+ + O2 + 2H2O

• 2MnO4- + 6H2O2 -> 2Mn2+ + 5O2 + 8H2O

What is the half-reaction for the reduction of MnO4- to Mn2+ in acidic solution?

• MnO4- + 6H+ + 5e- -> Mn2+ + 3H2O

• MnO4- + 8H+ + 5e- -> Mn2+ + 4H2O

• MnO4- + 4H+ + 3e- -> Mn2+ + 2H2O

• MnO4- + 2H+ + 3e- -> Mn2+ + H2O

Balance the following redox reaction in acidic solution: Cl2 + NO3- -> Cl- + NO

• Cl2 + 2NO3- -> 2Cl- + 2NO

• 2Cl2 + 10NO3- + 12H+ -> 2Cl- + 10NO + 6H2O

• 2Cl2 + 10NO3- + 12H+ -> 2Cl- + 10NO + 6H2O + 2H+

• 2Cl2 + 10NO3- + 6H+ -> 2Cl- + 10NO + 3H2O

What is the half-reaction for the oxidation of Cl2 to Cl- in acidic solution?

• 2Cl2 -> 4Cl-

• 2Cl2 + 2e- -> 4Cl-

• 2Cl2 + 2e- -> 2Cl-

• Cl2 + 2e- -> 2Cl-

Balance the following redox reaction in acidic solution: Cr2O7^2- + Fe2+ -> Cr3+ + Fe3+

• 14H+ + Cr2O7^2- + 6Fe2+ -> 2Cr3+ + 6Fe3+ + 3H2O

• 14H+ + Cr2O7^2- + 6Fe2+ -> 2Cr3+ + 6Fe3+ + 8H2O

• 14H+ + Cr2O7^2- + 6Fe2+ -> 2Cr3+ + 6Fe3+ + 5H2O

• 14H+ + Cr2O7^2- + 6Fe2+ -> 2Cr3+ + 6Fe3+ + 7H2O

What is the half-reaction for the reduction of Cr2O7^2- to Cr3+ in acidic solution?

• 2Cr2O7^2- + 14H+ + 8e- -> 2Cr3+ + 7H2O

• 2Cr2O7^2- + 10H+ + 6e- -> 2Cr3+ + 5H2O

• 2Cr2O7^2- + 14H+ + 4e- -> 2Cr3+ + 7H2O

• 2Cr2O7^2- + 14H+ + 6e- -> 2Cr3+ + 7H2O

Balance the following redox reaction in acidic solution: MnO4- + SO2 -> Mn2+ + SO4^2-

• MnO4- + 3SO2 + 2H+ -> Mn2+ + 3SO4^2- + 2H2O

• MnO4- + 2SO2 + 2H+ -> Mn2+ + 2SO4^2- + 2H2O

• MnO4- + 4SO2 + 4H+ -> Mn2+ + 4SO4^2- + 4H2O

• MnO4- + 5SO2 + 6H+ -> Mn2+ + 5SO4^2- + 6H2O

What is the half-reaction for the oxidation of SO2 to SO4^2- in acidic solution?

• SO2 + H2O -> H2SO4 + 2e-

• 2SO2 + 2H2O -> 2SO3 + 4H+ + 4e-

• 2SO2 + O2 -> 2SO4^2-

• 2SO2 + 2H2O -> 2SO4^2- + 4H+ + 4e-

Balance the following redox reaction in acidic solution: H2O2 + MnO2 -> O2 + Mn2+

• 2H2O2 + MnO2 + 2H+ -> O2 + Mn2+ + 2H2O

• 2H2O2 + MnO2 -> O2 + Mn2+ + H2O + H+

• 2H2O2 + MnO2 + 2H+ -> O2 + Mn2+ + H2O

• H2O2 + MnO2 + H+ -> O2 + Mn2+ + H2O