Question

Which of the following is the most dangerous metal pollutant of automobile exhaust ?

• A. Cadmium
• B. Copper
• C. Mercury
• D. Lead

Answer 1

Answer: (D)

Lead

Answer 2

Automobiles burn petroleum inefficiently causing $80\%$ of air pollution and $75\%$ of noise pollution in urban areas. They release hydrocarbons $(13.7\%)$, carbon monoxide $(77.2\%)$, nitrogen oxides $(7.7\%)$, sulphur oxides, ammonia, aldehydes and lead (90% of total lead poisoning). Lead is present in petroleum in the form of $Pb(CH_3)_4$ and $Pb(C_2H_5)_4$ as antiknock agent.