HAZMAT CLASS 5 DIVISION 5.1 AND 5.2
EXAM QUESTIONS WITH 100% FULLY
CORRECT ANSWERS LATEST UPDATED
2025/2026
HAZMAT 5A TEST
294 QUESTIONS AND ANSWERS
1. What does Class 5 hazardous material include?
• A) Flammable solids and liquids
• B) Oxidisers and organic peroxides
• C) Corrosive materials
• D) Radioactive materials
Answer: B) Oxidizers and organic peroxides
2. Division 5.1 specifically refers to:
• A) Organic peroxides
• B) Oxidizers
• C) Combustible liquids
• D) Toxic gases
Answer: B) Oxidizers
3. Division 5.2 specifically refers to:
• A) Organic peroxides
• B) Oxidizers
, • C) Combustible liquids
• D) Toxic gases
Answer: A) Organic peroxides
4. Which of the following best defines an oxidizer?
• A) A substance that removes oxygen from the atmosphere
• B) A substance that yields oxygen to stimulate combustion
• C) A substance that reduces fire intensity
• D) A substance that neutralizes acids
Answer: B) A substance that yields oxygen to stimulate combustion
5. What is the primary hazard of oxidizers (Division 5.1)?
• A) They can cause severe burns to skin
• B) They are highly toxic if inhaled
• C) They yield oxygen and intensify fires
• D) They are always explosive
Answer: C) They yield oxygen and intensify fires
6. Organic peroxides are characterized by having which functional group in
their molecular structure?
• A) Hydroxyl group (-OH)
• B) Carboxyl group (-COOH)
• C) Peroxide group (-O-O-)
• D) Amino group (-NH2)
Answer: C) Peroxide group (-O-O-)
7. What is the primary hazard of organic peroxides (Division 5.2)?
• A) Extremely high toxicity
• B) Thermally unstable and may explode
• C) Rapid absorption through skin
• D) Generation of toxic fumes at room temperature
Answer: B) Thermally unstable and may explode
,8. Which statement is true about organic peroxides?
• A) They are always stable at room temperature
• B) They are insensitive to impact and friction
• C) They can decompose explosively when heated
• D) They are non-flammable
Answer: C) They can decompose explosively when heated
9. The general formula for organic peroxides is:
• A) R-O-R
• B) R-O-O-R
• C) R-CO-R
• D) R-OH
Answer: B) R-O-O-R
10. Which of these is NOT typically an oxidizer?
• A) Hydrogen peroxide
• B) Potassium permanganate
• C) Ammonium nitrate
• D) Benzene
Answer: D) Benzene
11. What makes oxidizers dangerous when in contact with combustible
materials?
• A) They lower the ignition temperature
• B) They provide oxygen to feed the fire
• C) They can cause fires without an ignition source
• D) All of the above
Answer: D) All of the above
12. Which environmental factor most significantly affects the stability of
organic peroxides?
• A) Humidity
, • B) Air pressure
• C) Temperature
• D) Wind speed
Answer: C) Temperature
13. The primary difference between Division 5.1 and Division 5.2 materials is:
• A) 5.1 materials are less dangerous than 5.2
• B) 5.1 materials are oxidizers while 5.2 are organic peroxides
• C) 5.1 materials are liquid while 5.2 are solid
• D) 5.1 materials are for commercial use while 5.2 are for industrial use
Answer: B) 5.1 materials are oxidizers while 5.2 are organic peroxides
14. A substance that readily yields oxygen or other oxidizing substances is
known as:
• A) Reducer
• B) Oxidizer
• C) Catalyst
• D) Inhibitor
Answer: B) Oxidizer
15. Which of the following is a common example of a Division 5.1 material?
• A) Benzoyl peroxide
• B) Ammonium picrate
• C) Calcium hypochlorite
• D) Mercury
Answer: C) Calcium hypochlorite
16. Which of the following is a common example of a Division 5.2 material?
• A) Nitric acid
• B) Benzoyl peroxide
• C) Sodium chlorate
• D) Potassium permanganate
EXAM QUESTIONS WITH 100% FULLY
CORRECT ANSWERS LATEST UPDATED
2025/2026
HAZMAT 5A TEST
294 QUESTIONS AND ANSWERS
1. What does Class 5 hazardous material include?
• A) Flammable solids and liquids
• B) Oxidisers and organic peroxides
• C) Corrosive materials
• D) Radioactive materials
Answer: B) Oxidizers and organic peroxides
2. Division 5.1 specifically refers to:
• A) Organic peroxides
• B) Oxidizers
• C) Combustible liquids
• D) Toxic gases
Answer: B) Oxidizers
3. Division 5.2 specifically refers to:
• A) Organic peroxides
• B) Oxidizers
, • C) Combustible liquids
• D) Toxic gases
Answer: A) Organic peroxides
4. Which of the following best defines an oxidizer?
• A) A substance that removes oxygen from the atmosphere
• B) A substance that yields oxygen to stimulate combustion
• C) A substance that reduces fire intensity
• D) A substance that neutralizes acids
Answer: B) A substance that yields oxygen to stimulate combustion
5. What is the primary hazard of oxidizers (Division 5.1)?
• A) They can cause severe burns to skin
• B) They are highly toxic if inhaled
• C) They yield oxygen and intensify fires
• D) They are always explosive
Answer: C) They yield oxygen and intensify fires
6. Organic peroxides are characterized by having which functional group in
their molecular structure?
• A) Hydroxyl group (-OH)
• B) Carboxyl group (-COOH)
• C) Peroxide group (-O-O-)
• D) Amino group (-NH2)
Answer: C) Peroxide group (-O-O-)
7. What is the primary hazard of organic peroxides (Division 5.2)?
• A) Extremely high toxicity
• B) Thermally unstable and may explode
• C) Rapid absorption through skin
• D) Generation of toxic fumes at room temperature
Answer: B) Thermally unstable and may explode
,8. Which statement is true about organic peroxides?
• A) They are always stable at room temperature
• B) They are insensitive to impact and friction
• C) They can decompose explosively when heated
• D) They are non-flammable
Answer: C) They can decompose explosively when heated
9. The general formula for organic peroxides is:
• A) R-O-R
• B) R-O-O-R
• C) R-CO-R
• D) R-OH
Answer: B) R-O-O-R
10. Which of these is NOT typically an oxidizer?
• A) Hydrogen peroxide
• B) Potassium permanganate
• C) Ammonium nitrate
• D) Benzene
Answer: D) Benzene
11. What makes oxidizers dangerous when in contact with combustible
materials?
• A) They lower the ignition temperature
• B) They provide oxygen to feed the fire
• C) They can cause fires without an ignition source
• D) All of the above
Answer: D) All of the above
12. Which environmental factor most significantly affects the stability of
organic peroxides?
• A) Humidity
, • B) Air pressure
• C) Temperature
• D) Wind speed
Answer: C) Temperature
13. The primary difference between Division 5.1 and Division 5.2 materials is:
• A) 5.1 materials are less dangerous than 5.2
• B) 5.1 materials are oxidizers while 5.2 are organic peroxides
• C) 5.1 materials are liquid while 5.2 are solid
• D) 5.1 materials are for commercial use while 5.2 are for industrial use
Answer: B) 5.1 materials are oxidizers while 5.2 are organic peroxides
14. A substance that readily yields oxygen or other oxidizing substances is
known as:
• A) Reducer
• B) Oxidizer
• C) Catalyst
• D) Inhibitor
Answer: B) Oxidizer
15. Which of the following is a common example of a Division 5.1 material?
• A) Benzoyl peroxide
• B) Ammonium picrate
• C) Calcium hypochlorite
• D) Mercury
Answer: C) Calcium hypochlorite
16. Which of the following is a common example of a Division 5.2 material?
• A) Nitric acid
• B) Benzoyl peroxide
• C) Sodium chlorate
• D) Potassium permanganate
