WorksheetsRedox Reactions Quiz
Total questions: 30
Worksheet time: 15mins
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⁺
What is the oxidation number of nitrogen in NO₃⁻?
+3
+5
-3
+1
Which of the following elements is commonly used as a reducing agent?
Oxygen
Fluorine
Hydrogen
Sulfur dioxide
In the equation: CuO + H₂ → Cu + H₂O Which substance is reduced?
Cu
CuO
H₂
H₂O
In redox reactions, the substance that gains electrons is:
The reducing agent
The oxidizing agent
The product
The catalyst
Which of the following is the correct half-reaction for the oxidation of Zn?
Zn²⁺ + 2e⁻ → Zn
Zn → Zn²⁺ + 2e⁻
Zn + 2e⁻ → Zn²⁺
Zn²⁺ → Zn + 2e⁻
In which reaction is oxygen acting as the oxidizing agent?
C + O₂ → CO₂
Cl₂ + 2KBr → 2KCl + Br₂
Zn + H₂SO₄ → ZnSO₄ + H₂
HCl + NaOH → NaCl + H₂O
What is the change in oxidation number of chlorine in the reaction: Cl₂ → 2Cl⁻
0 to -1
-1 to 0
0 to +1
+1 to 0
Which of the following is true for all redox reactions?
Energy is absorbed
Electrons are transferred
Gases are released
Precipitates are formed
Which process is an example of oxidation?
Gain of hydrogen
Gain of electrons
Loss of electrons
Loss of oxygen
What is the reducing agent in this redox pair: Fe²⁺/Fe³⁺?
Fe³⁺
Fe²⁺
Fe
Fe⁰
Identify the species undergoing oxidation in the reaction: 2Fe²⁺ + Cl₂ → 2Fe³⁺ + 2Cl⁻
Fe²⁺
Cl₂
Fe³⁺
Cl⁻
Which of these is NOT a redox reaction?
Zn + 2HCl → ZnCl₂ + H₂
HCl + NaOH → NaCl + H₂O
C + O₂ → CO₂
Fe + CuSO₄ → FeSO₄ + Cu
What happens to Fe³⁺ when it gains an electron?
It is oxidized
It is reduced
It decomposes
It neutralizes
Which is the oxidation number of O in H₂O₂?
-2
+1
-1
0
Which of the following is both oxidized and reduced in the same reaction?
Cl₂
HCl
NaOH
H₂O
The oxidation number of hydrogen in metal hydrides is:
+1
-1
0
+2
In redox reactions, what does the oxidizing agent do?
Gains electrons
Loses electrons
Produces electrons
Prevents oxidation
Which of the following is a disproportionation reaction?
Cl₂ + H₂O → HCl + HClO
Zn + Cu²⁺ → Zn²⁺ + Cu
H₂ + Cl₂ → 2HCl
Fe + O₂ → Fe₂O₃
What is the oxidation number of Mn in KMnO₄?
+2
+4
+7
+6
In which reaction is hydrogen oxidized?
H₂ + Cl₂ → 2HCl
2Na + Cl₂ → 2NaCl
Zn + H₂SO₄ → ZnSO₄ + H₂
CO + H₂O → CO₂ + H₂
