Which of the following is most poisonous?
Correct answer: A. CO
- A. CO
- B. CO2
- C. C
- D. SO2
Explanation
Carbon monoxide is especially poisonous because it binds haemoglobin strongly and prevents blood from carrying oxygen. Carbon dioxide is mainly an asphyxiant at high concentration, while sulphur dioxide is primarily an irritating respiratory pollutant.
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