Redox Reactions Quiz

Which of the following is a redox reaction?

• NaCl → Na⁺ + Cl⁻

• HCl + NaOH → NaCl + H₂O

• 2Na + Cl₂ → 2NaCl

• AgNO₃ + NaCl → AgCl + NaNO₃

In the redox reaction: Zn + Cu²⁺ → Zn²⁺ + Cu, which species is oxidized?

• Cu²⁺

• Cu

• Zn²⁺

• Zn

Which of these reactions involves both oxidation and reduction?

• Neutralization

• Precipitation

• Redox

• Dissociation

What is the oxidation number of sulfur in H₂SO₄?

• +4

• +6

• +2

• -2

Which of the following is reduced in the reaction: Fe²⁺ + Cl₂ → Fe³⁺ + 2Cl⁻

• Fe²⁺

• Fe³⁺

• Cl₂

• Cl⁻

In a redox reaction, oxidation is defined as:

• Loss of electrons

• Gain of electrons

• Addition of hydrogen

• Removal of oxygen

Which of the following is an example of a redox reaction?

• H₂ + Cl₂ → 2HCl

• Ag⁺ + Cl⁻ → AgCl

• NaOH + HCl → NaCl + H₂O

• NH₃ + HCl → NH₄Cl

What happens to the oxidation number of an element that is oxidized?

• It increases

• It decreases

• It remains the same

• It becomes zero

Identify the reducing agent in the reaction: 2H₂ + O₂ → 2H₂O

• H₂O

• H₂

• O₂

• None

Which species acts as the oxidizing agent in: MnO₄⁻ + 8H⁺ + 5Fe²⁺ → Mn²⁺ + 5Fe³⁺ + 4H₂O

• MnO₄⁻

• H⁺

• Fe²⁺

• Fe³⁺