Grade 12 Oxidation and Reduction Quiz

What is the oxidation number of a monatomic ion?

• +2

• 0

• -1

• +1

What are the oxidation numbers in the compound KC1?

• K = 0, Cl = 0

• K = -1, Cl = +1

• K = +1, C1=-1

• K = +2, Cl = -2

In the reaction represented by the equation 0₂ + 4e¯ → 2 0^2-, the species O₂ is

• C. neutralized.

• disproportionated.

• oxidized.

• reduced.

The conversion of Mg → Mg²⁺ + 2e¯ is

• disproportionation.

• neutralized.

• reduction.

• oxidation.

During redox reactions, reducing agents

• increase their oxidation number.

• decrease their oxidation number.

• keep the same oxidation number.

• do not participate.

When Na(s) reacts with Cl₂ (g) to produce NaCl (s), Na(s) is the

• oxidizing agent.

• reducing agent.

• neutralizing agent.

• ionizing agent.

Which of the following statements refers to an oxidation process?

• Hydrogen is added to ethene

• Oxygen is removed from carbon dioxide

• Chlorine accepts electrons

• Increase in the oxidation number of magnesium metal

Which of these equations represents a redox reaction?

• Ca(HCO₃)_{2 -->} CaCO₃ + H₂O + CO₂

• CH₃COOH + NaOH --> CH₃COONa + H₂O

• Zn + 2FeCl₃ --> ZnCl₂ + 2FeCl₂

• NaCl + AgNO_{3 -->} AgCl + NaNO₃

What is the oxidation number of chlorine in ClO₃^- ?

• -1

• +1

• -1

• +5

What are the oxidation numbers of manganese in the manganese compounds shown below?

• A

• B

• C

• D