Which of the following is the most toxic gas?
Correct answer: B. Carbon monoxide
- A. Carbon dioxide
- B. Carbon monoxide
- C. Nitrogen
- D. Hydrogen
Explanation
Carbon monoxide is highly toxic because it binds haemoglobin strongly and prevents blood from carrying oxygen. Nitrogen and hydrogen are not poisonous at ordinary concentrations, while carbon dioxide is mainly dangerous at high concentrations.
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