G10 Final Exam Review Part 3

Which of the following best defines a redox reaction?

• A reaction involving the exchange of protons

• A reaction involving a change in temperature

• A reaction involving the transfer of electrons

• A reaction that forms a precipitate

In the reaction: Mg + Cl2 → MgCl2 Which species is oxidized?

• Mg

• Cl₂

• MgCl₂

• None

What is the oxidation number of sulfur in H2SO4?

• +4

• +6

• -2

• +2

Which of the following is always true in a redox reaction?

• Only reduction takes place

• Oxidation and reduction occur simultaneously

• Electrons are gained by both species

• Energy is always released

In the reaction: Zn + Cu2+ → Zn2+ + Cu Which is the reducing agent?

• Zn

• Cu

• Cu²⁺

• Zn²⁺

What is the oxidation number of Mn in KMnO4?

• +2

• +4

• +7

• -1

Which of the following reactions is a redox reaction?

• HCl + NaOH → NaCl + H₂O

• AgNO₃ + NaCl → AgCl + NaNO₃

• 2Na + Cl₂ → 2NaCl

• BaCl₂ + H₂SO₄ → BaSO₄ + 2HCl

What is the oxidizing agent in the following reaction? H2 + F2 → 2HF

• H₂

• F₂

• HF

• H⁺

Which substance is reduced in the reaction: 2Al + Fe2O3 → Al2O3 + 2Fe

• Al

• Fe

• O

• Al₂O₃

In an acidic solution, what is the correct half-reaction for the reduction of MnO4⁻ to Mn²⁺?

• MnO4- → Mn2+

• MnO4- + 5e- → Mn2+

• MnO4- + 8H+ + 5e- → Mn2+ + 4H2O

• MnO4- + 4H+ + e- → Mn3+ + 2H2O