Redox Reactions Mastery

What is the oxidation number of oxygen in H2O2?

• 0

• -2

• -1

• 2

Define reduction potential in the context of redox reactions.

• Reduction potential is a measure of the tendency of a chemical species to acquire electrons and undergo reduction.

• Reduction potential is only applicable to inorganic compounds, not organic compounds.

• Reduction potential is not related to electron transfer in redox reactions.

• Reduction potential is a measure of the tendency of a chemical species to lose electrons and undergo oxidation.

Balance the following redox equation: Fe2+ + MnO4- -> Fe3+ + Mn2+ (acidic solution)

• 2Fe2+ + 5MnO4- + 16H+ -> 2Fe3+ + 5Mn2+ + 8H2O2

• Fe2+ + MnO4- -> Fe3+ + Mn2+ (neutral solution)

• 2Fe2+ + 5MnO4- + 16H+ -> 2Fe3+ + 5Mn2+ + 8H2O

• Fe2+ + MnO4- -> Fe3+ + Mn2+ (basic solution)

Write the half-reaction for the oxidation of Cl- to Cl2.

• 2Cl- -> Cl + 2e-

• 2Cl- -> Cl2 + 3e-

• 2Cl- -> Cl2 + 2e-

• Cl- -> Cl2 + 2e-

Explain the concept of redox titrations and how they are used in analytical chemistry.

• Redox titrations involve acid-base reactions and are used in analytical chemistry to determine substance concentrations.

• Redox titrations involve electron transfer reactions and are used in analytical chemistry to determine substance concentrations.

• Redox titrations involve precipitation reactions and are used in analytical chemistry to determine substance concentrations.

• Redox titrations involve phase changes and are used in analytical chemistry to determine substance concentrations.

What is the oxidation number of sulfur in H2SO4?

• +8

• +6

• +4

• -2

Calculate the standard cell potential for the reaction: Zn(s) + Cu2+(aq) -> Zn2+(aq) + Cu(s)

• 0.80 V

• 1.50 V

• 0.25 V

• 1.10 V

Balance the following redox equation: Cr2O7^2- + SO2 -> Cr^3+ + SO4^2- (acidic solution)

• Cr2O7^2- + 12H+ + 5SO2 -> 2Cr^3+ + 6H2O + 3SO4^2-

• Cr2O7^2- + 12H+ + 5SO2 -> 2Cr^3+ + 7H2O + 3SO4^2-

• Cr2O7^2- + 10H+ + 5SO2 -> 2Cr^3+ + 5H2O + 3SO4^2-

• Cr2O7^2- + 12H+ + 5SO2 -> 2Cr^3+ + 7H2O + 3SO4^2

Identify the reducing agent in the reaction: 2H2O -> O2 + 4H+ + 4e-

• H2

• H2O

• H+

• O

What is the purpose of a salt bridge in a galvanic cell?

• To prevent the flow of electrons between the two half-cells

• To increase the voltage output of the cell

• To maintain electrical neutrality and allow the flow of ions between the two half-cells.

• To regulate the temperature within the cell