1. Catalytic converters reduce which of the following pairs of pollutants in car exhaust? a.)Carbon dioxide and ozone b.)Carbon monoxide and hydrocarbons
c.)Carbon dioxide and particulates
d.) Lead and mercury
e.)Methane and particulates​

B

Explanation: By most estimates, catalytic converters fitted inside the exhaust pipe of a gasoline-operated car convert over 90% of hydrocarbons (HC), carbon monoxide (CO) and nitrogen oxides (NOx) from the engine into less harmful carbon dioxide (CO2), nitrogen and water vapour.

correct answer is a. and d.