Answer: binds strongly to haemoglobin.
- A it causes acid rain
- B binds strongly to haemoglobin
- C it depletes the ozone layer
- D it merely forms smog
Correct answer: B. binds strongly to haemoglobin
Explanation: CO binds to haemoglobin far more tightly than O₂, blocking oxygen transport in the blood.
Classical smog is a reducing mixture of SO₂ and fog, while photochemical smog is an oxidising mixture generated by UV-driven reactions of NOx and hydrocarbons.
Concept context
Understand how human activities alter the atmosphere, water, and soil. Covers air pollutants, smog types, ozone depletion, acid rain, greenhouse effect, water and soil pollution, and the principles of green chemistry.