Chemistry Grade 11 Redox Reactions Quiz

What is the oxidation number of oxygen in H2O2?

• -1

• 2

• 0

• -2

Balance the following redox reaction using the oxidation number method: HClO4 + SnCl2 → HCl + SnCl4

• HClO4 + SnCl2 → H2Cl + 2SnCl4

• HClO4 + 2SnCl2 → HCl + SnCl4

• 2HClO4 + SnCl2 → 2HCl + SnCl4

• 2HClO4 + SnCl2 → H2Cl + SnCl4

In the reaction: MnO4- + 8H+ + 5e- → Mn2+ + 4H2O, identify the reducing agent.

• H+

• MnO4-

• Mn2+

• 5e-

Explain the concept of gram equivalent in redox reactions.

• The color of a substance in redox reactions

• The weight of a substance in grams

• Amount of a substance that can either donate or accept one mole of electrons

• The volume of a substance in liters

Calculate the equivalent mass of H2SO4.

• 36 g/equiv

• 60 g/equiv

• 49 g/equiv

• 25 g/equiv

What is the half reaction for the oxidation of Fe to Fe3+?

• Fe -> Fe3+ + 3e-

• Fe -> Fe4+ + 4e-

• Fe -> Fe+ + e-

• Fe -> Fe2+ + 2e-

Balance the following redox reaction using the half reaction method: Cr2O7^2- + SO2 → Cr^3+ + SO4^2-

• Cr2O7^2- + 3SO2 + 6H^+ → 2Cr^3+ + 3SO4^2- + 3H2O

• Cr2O7^2- + 3SO2 + 8H^+ → 2Cr^3+ + 3SO4^2- + 4H2O

• Cr2O7^2- + 4SO2 + 10H^+ → 2Cr^3+ + 4SO4^2- + 5H2O

• Cr2O7^2- + 2SO2 + 6H^+ → 2Cr^3+ + 2SO4^2- + 3H2O

How is the equivalent mass related to molar mass?

• The equivalent mass is only used in organic chemistry

• The equivalent mass is equal to the molar mass

• The equivalent mass is not related to molar mass at all

• The equivalent mass is related to molar mass through the concept of equivalents.

In the reaction: Cl2 + 2e- → 2Cl-, identify the species being oxidized.

• H2O

• 2Cl-

• 2e-

• Cl2

What is the oxidation number of nitrogen in NH3?

• 5

• 0

• -3

• 2