Redox Reactions Quiz

What is the oxidation number of iron in iron(II) oxide?

• 2+

• 0

• 3+

• 1+

What is a redox reaction?

• A reaction that does not involve oxygen

• A reaction where oxidation and reduction occur simultaneously

• A reaction where only reduction occurs

• A reaction where only oxidation occurs

What does the Roman numeral in a compound name indicate?

• The molecular weight

• The number of atoms

• The type of bond

• The oxidation state of the element

In the reaction between zinc oxide and carbon, which substance is oxidized?

• Zinc oxide

• Oxygen

• Carbon

• None of the above

What is the name of the compound CoCl₂?

• Cobalt(I) chloride

• Cobalt(II) chloride

• Cobalt(III) chloride

• Cobalt chloride

Answer explanation

This ionic compound contains the following ions:

Co²⁺ (The 2+ charge is shown in roman numerals)

2 Cl^- (remember that group 7 elements form -1 ions)

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

• It decreases

• It remains the same

• It increases

• It becomes negative

Which of the following are examples of reduction?

• Cu²⁺ + 2e^- → Cu

• Fe → Fe²⁺ + 2e^-

• O₂ + 4e^- → 2O^2-

• Ag → Ag⁺ + e^-

Answer explanation

OIL RIG

Oxidation is the loss of electrons

Reduction is the gain of electrons

In the reaction Fe + CuSO4 → FeSO4 + Cu, which element is oxidized?

• Oxygen

• Sulfur

• Iron

• Copper

What does the mnemonic OIL-RIG stand for?

• Oxidation Is Loss, Reduction Is Gain

• Oxidation Is Light, Reduction Is Gain

• Oxygen Is Lost, Reduction Is Gained

• Oxidation Is Loss, Reduction Is Gained

What is the oxidation state of silver in silver(I) chloride?

• 3

• 1

• 0

• 2