A) CO
B) \[C{{H}_{4}}\]
C) chlorine
D) \[N{{O}_{2}}\]
Correct Answer: A
Solution :
Automobile exhausts are a source of considerable air pollution. In the major metropolitan cities vehicular exhausts account for 70% of all CO, 50% of all hydrocarbons, 30-40% of alloxides and 30% of all SPM. CO causes difficulty in breathing, causes headache and irritation of mucous membrane. It combines with haemoglobin of blood and reducing its oxygen carrying capacity. \[N{{O}_{2}}\] gas is the chief constituent of photochemical smog in metropolitan area. \[N{{O}_{2}}\] causes irritation of alveoli leading to symptoms resembling emphysema (inflammation) upon prolonged exposure. Methane \[(C{{H}_{4}})\] is produced when organic matter decays under anaerobic conditions. Huge quantity of methane is produced in agricultural fields. About 15% of global warming is attributed to methane.
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