Main pollutant present in automobile exhaust is_________________?
Correct answer: D. CO
- A. Hydrocarbons
- B. CO2
- C. NO
- D. CO
Explanation
Incomplete combustion in spark-ignition automobile engines produces carbon monoxide, making CO the characteristic major pollutant in untreated exhaust. Carbon dioxide is a combustion product and hydrocarbons and nitrogen oxides are also emitted, but usually are not the intended main pollutant here.
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