Q: Which of the following equations correctly represents the toxic action of cyanide ions in the body?

$$\text{Cyanide inhibits cytochrome c oxidase:} \\ \text{Cyt~a_3$^{2+} + CN^- \rightarrow Cyt~a_3$^{2+}-CN}$$

Question 1

Which of the following best describes the mechanism of action of blood agents such as hydrogen cyanide (HCN)?

Accepted Answer

They inhibit the enzymes involved in cellular respiration, preventing cells from using oxygen.

Question 2

A patient exposed to a chemical warfare agent presents with cherry-red skin, rapid loss of consciousness, and a bitter almond odor on their breath. Which agent is most likely responsible?

Accepted Answer

Hydrogen cyanide

Question 3

Which chemical equation represents the industrial synthesis of hydrogen cyanide via the Andrussow process?

Accepted Answer

$$2CH_4 + 2NH_3 + 3O_2 \rightarrow 2HCN + 6H_2O$$

Question 4

Which of the following statements about sulphur mustard (HD) is CORRECT?

Accepted Answer

It is fat-soluble and can be absorbed through the skin, causing delayed blistering.

Question 5

Which property makes nerve agents of the V-series (e.g., VX) more persistent in the environment compared to G-series agents (e.g., Sarin)?

Accepted Answer

Lower vapor pressure

Question 6

A soldier exposed to a chemical agent develops severe conjunctivitis, blistering of the skin, and bronchopneumonia. Which class of chemical warfare agent is most likely responsible?

Accepted Answer

Blister agents (vesicants)

Question 7

Which of the following is a distinguishing feature of cyanogen chloride (CK) compared to hydrogen cyanide (AC)?

Accepted Answer

CK has strong irritating and choking effects in addition to its cyanogenic action.

Question 8

Which of the following best explains why mustards (HD, HN) are particularly damaging to the skin and eyes?

Accepted Answer

They bind to biomolecules, causing chemical injuries, especially in rapidly dividing cells.

Question 9

Which of the following is the correct chemical structure for sulphur mustard?

Accepted Answer

$$Cl-CH_2CH_2-S-CH_2CH_2-Cl$$

Question 10

Which of the following is a real-world example of the use of hydrogen cyanide as a chemical weapon?

Accepted Answer

Employed by the Nazis in concentration camp gas chambers

Question 11

A chemical agent causes rapid paralysis and death by interfering with the breakdown of acetylcholine at synapses. Which enzyme is inhibited by this agent?

Accepted Answer

Acetylcholinesterase

Question 12

Which of the following best describes the main military purpose of blister agents (vesicants) such as sulphur mustard?

Accepted Answer

To incapacitate and consume enemy resources by causing prolonged hospitalizations

Question 13

Which of the following statements about Lewisite is TRUE?

Accepted Answer

It causes immediate pain and irritation, and has an antidote called British Anti-Lewisite (BAL).

Question 14

Which of the following equations correctly represents the toxic action of cyanide ions in the body?

Accepted Answer

$$	ext{Cyanide inhibits cytochrome c oxidase:} \ 	ext{Cyt~a_3$^{2+} + CN^- ightarrow Cyt~a_3$^{2+}-CN}$$

Question 15

Which of the following best explains why a protective mask is effective against blood agents like hydrogen cyanide?

Accepted Answer

It prevents inhalation of the agent, which is the primary route of exposure.

Question 16

Which of the following is a key difference between G-series and V-series nerve agents?

Accepted Answer

V-series agents are more persistent and less volatile than G-series agents.

Question 17

A chemical agent is described as a colorless, volatile liquid with a boiling point of 26°C, a bitter almond odor, and is less dense than air. Which agent fits this description?

Accepted Answer

Hydrogen cyanide

Question 18

Which of the following best describes the effect of blister agents on the respiratory tract?

Accepted Answer

They attack mucous membranes, causing blistering and increasing susceptibility to infection.

Question 19

Which of the following is a correct statement about the use of nitrogen mustards?

Accepted Answer

They have been used as chemotherapy drugs to treat certain cancers.

Question 20

Which of the following best explains why binary chemical weapons are considered safer to handle before use?

Accepted Answer

They are stored as two less toxic precursors that only combine to form the active agent upon deployment.

Chemical Warfare Agents: Classification, Properties, and Mechanisms

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