Redox Quiz

In the reaction 2Mg + O₂ → 2MgO, which substance is oxidized?

• Mg

• O₂

• MgO

• None

Which of the following is a correct description of a reducing agent?

• A substance that loses electrons.

• A substance that gains electrons.

• A substance that is oxidized.

• A substance that is reduced.

In the reaction H₂ + F₂ → 2HF, which element is reduced?

• H₂

• F₂

• HF

• None

Which of the following reactions demonstrates oxidation in terms of oxygen transfer?

• 2H₂ + O₂ → 2H₂O

• CuO + H₂ → Cu + H₂O

• C + O₂ → CO₂

• Fe + S → FeS

In the reaction 2Fe + 3Cl₂ → 2FeCl₃, which is the oxidizing agent?

• Fe

• Cl₂

• FeCl₃

• None

Which of the following processes involves reduction?

• Gain of electrons

• Gain of oxygen

• Loss of hydrogen

• Loss of electrons

In the reaction 2SO₂ + O₂ → 2SO₃, which substance acts as the oxidizing agent?

• SO₂

• O₂

• SO₃

• None

In a redox reaction, what role does a substance that gains oxygen typically play?

• Oxidizing agent

• Reducing agent

• Both

• Neither

During the reaction 2Na + Cl₂ → 2NaCl, sodium is:

• Oxidized

• Reduced

• Neither

• Both

Which of the following statements correctly describes an oxidizing agent?

• It loses oxygen.

• It loses electrons.

• It gains electrons.

• It gains oxygen.