Redox Reactions Quiz

What is the primary characteristic of redox reactions?

• They do not involve electron transfer.

• They involve both oxidation and reduction.

• They involve only reduction.

• They involve only oxidation.

In the reaction 2Mg + O2 → 2MgO, what is being oxidized?

• None of the above

• Magnesium

• Oxygen

• Magnesium oxide

What does the term 'oxidizing agent' refer to?

• A substance that is reduced.

• A substance that is oxidized.

• A substance that gains electrons.

• A substance that loses electrons.

Which of the following is a redox reaction?

• H2O → H2 + O2

• H2 + Cl2 → 2HCl

• CaCO3 → CaO + CO2

• NaCl → Na + Cl2

What is the oxidation state of sulfur in H2SO4?

• 0

• -2

• +4

• +6

In the reaction 2H2S + O2 → 2S + 2H2O, which species is reduced?

• S

• O2

• H2S

• H2O

What is the role of a reducing agent in a redox reaction?

• It gains electrons.

• It loses electrons.

• It is oxidized.

• It is reduced.

Which of the following reactions is an example of a disproportionation reaction?

• 2Na + Cl2 → 2NaCl

• Zn + Cu2+ → Zn2+ + Cu

• 2H2O2 → 2H2O + O2

• C + O2 → CO2

What is the oxidation number of chlorine in ClO3-?

• +5

• +3

• 0

• -1

In a galvanic cell, which electrode is the anode?

• The electrode with the higher potential.

• The electrode connected to the salt bridge.

• The electrode where oxidation occurs.

• The electrode where reduction occurs.