FDNY C42 Storage and Handling of Corrosives and
Oxidizers 2026
Exam Practice Questions – Questions
Verified Answers with Expert Rationales | 2026 Edition
SECTION 1: HAZARD IDENTIFICATION & CLASSIFICATION
(Questions 1-30)
Question 1:
The primary hazard associated with corrosive materials is their ability to:
A) Release flammable vapors
B) React violently with water
C) Destroy living tissue and materials
D) Produce toxic smoke when heated
*Answer: * C) Destroy living tissue and materials
*Rationale: * Corrosives are defined by their ability to chemically damage or destroy
living tissue and materials on contact. This is their primary distinguishing hazard.
Question 2:
Corrosive substances are typically classified as:
,A) Flammable liquids
B) Acids and bases
C) Explosives
D) Oxidizing agents
*Answer: * B) Acids and bases
*Rationale: * Corrosives primarily include acids and bases, which are capable of
destroying living tissue and materials through chemical action.
Question 3:
Which of the following is considered a corrosive material?
A) Water
B) Sulfuric acid
C) Sand
D) Glass
*Answer: * B) Sulfuric acid
*Rationale: * Corrosive materials can chemically destroy or irreversibly damage another
substance with which they come into contact, such as sulfuric acid.
Question 4:
Which of the following is considered a common corrosive chemical in a fire department
setting?
A) Sodium chloride
B) Sulfuric acid
C) Methane
D) Helium
*Answer: * B) Sulfuric acid
*Rationale: * Sulfuric acid is a highly corrosive chemical that can cause severe burns and
damage to metals, making it a key focus in corrosive chemical handling.
,Question 5:
Oxidizers are dangerous because they:
A) Burn easily by themselves
B) Increase the burning rate of other materials
C) Neutralize flammable liquids
D) Prevent combustion
*Answer: * B) Increase the burning rate of other materials
*Rationale: * Oxidizers support and intensify combustion by providing oxygen or another
oxidizing agent.
Question 6:
What is the primary hazard associated with oxidizers?
A) Flammability
B) Reaction with combustible materials
C) Corrosion of metals
D) Explosive vapor formation
*Answer: * B) Reaction with combustible materials
*Rationale: * Oxidizers can cause or enhance combustion of other materials, even without
an ignition source. They supply oxygen that can accelerate the combustion of other
materials.
Question 7:
Oxidizers themselves may not be flammable, but they:
A) Release oxygen or other oxidizing agents that can cause or intensify fires
B) Absorb heat from the environment
C) Dilute flammable liquids
D) Neutralize corrosive materials
, *Answer: * A) Release oxygen or other oxidizing agents that can cause or intensify
fires
*Rationale: * Oxidizers themselves may not be flammable, but they release oxygen or
other oxidizing agents that can cause or intensify fires.
Question 8:
Corrosive substances primarily cause damage by:
A) Igniting on contact
B) Destroying or irreversibly damaging living tissue or materials
C) Exploding when heated
D) Releasing toxic gases
*Answer: * B) Destroying or irreversibly damaging living tissue or materials
*Rationale: * Corrosives chemically damage skin, eyes, or metals upon contact.
Question 9:
Which of the following is a Class 8 hazardous material under DOT regulations?
A) Gasoline
B) Corrosive substances
C) Explosives
D) Radioactive material
*Answer: * B) Corrosive substances
*Rationale: * Class 8 materials include corrosive substances that can destroy human
tissue or materials.
Question 10:
The NFPA 704 diamond uses which color to represent oxidizers?
Oxidizers 2026
Exam Practice Questions – Questions
Verified Answers with Expert Rationales | 2026 Edition
SECTION 1: HAZARD IDENTIFICATION & CLASSIFICATION
(Questions 1-30)
Question 1:
The primary hazard associated with corrosive materials is their ability to:
A) Release flammable vapors
B) React violently with water
C) Destroy living tissue and materials
D) Produce toxic smoke when heated
*Answer: * C) Destroy living tissue and materials
*Rationale: * Corrosives are defined by their ability to chemically damage or destroy
living tissue and materials on contact. This is their primary distinguishing hazard.
Question 2:
Corrosive substances are typically classified as:
,A) Flammable liquids
B) Acids and bases
C) Explosives
D) Oxidizing agents
*Answer: * B) Acids and bases
*Rationale: * Corrosives primarily include acids and bases, which are capable of
destroying living tissue and materials through chemical action.
Question 3:
Which of the following is considered a corrosive material?
A) Water
B) Sulfuric acid
C) Sand
D) Glass
*Answer: * B) Sulfuric acid
*Rationale: * Corrosive materials can chemically destroy or irreversibly damage another
substance with which they come into contact, such as sulfuric acid.
Question 4:
Which of the following is considered a common corrosive chemical in a fire department
setting?
A) Sodium chloride
B) Sulfuric acid
C) Methane
D) Helium
*Answer: * B) Sulfuric acid
*Rationale: * Sulfuric acid is a highly corrosive chemical that can cause severe burns and
damage to metals, making it a key focus in corrosive chemical handling.
,Question 5:
Oxidizers are dangerous because they:
A) Burn easily by themselves
B) Increase the burning rate of other materials
C) Neutralize flammable liquids
D) Prevent combustion
*Answer: * B) Increase the burning rate of other materials
*Rationale: * Oxidizers support and intensify combustion by providing oxygen or another
oxidizing agent.
Question 6:
What is the primary hazard associated with oxidizers?
A) Flammability
B) Reaction with combustible materials
C) Corrosion of metals
D) Explosive vapor formation
*Answer: * B) Reaction with combustible materials
*Rationale: * Oxidizers can cause or enhance combustion of other materials, even without
an ignition source. They supply oxygen that can accelerate the combustion of other
materials.
Question 7:
Oxidizers themselves may not be flammable, but they:
A) Release oxygen or other oxidizing agents that can cause or intensify fires
B) Absorb heat from the environment
C) Dilute flammable liquids
D) Neutralize corrosive materials
, *Answer: * A) Release oxygen or other oxidizing agents that can cause or intensify
fires
*Rationale: * Oxidizers themselves may not be flammable, but they release oxygen or
other oxidizing agents that can cause or intensify fires.
Question 8:
Corrosive substances primarily cause damage by:
A) Igniting on contact
B) Destroying or irreversibly damaging living tissue or materials
C) Exploding when heated
D) Releasing toxic gases
*Answer: * B) Destroying or irreversibly damaging living tissue or materials
*Rationale: * Corrosives chemically damage skin, eyes, or metals upon contact.
Question 9:
Which of the following is a Class 8 hazardous material under DOT regulations?
A) Gasoline
B) Corrosive substances
C) Explosives
D) Radioactive material
*Answer: * B) Corrosive substances
*Rationale: * Class 8 materials include corrosive substances that can destroy human
tissue or materials.
Question 10:
The NFPA 704 diamond uses which color to represent oxidizers?
