Question

The pollution of air caused by burning petroleum fuels (like petrol and diesel) in vehicles can be controlled by fitting a device X in the exhaust system of vehicles.

(a) Name the device X.
(b) How does this device help in controlling air pollution?

Answer 1

(a) The device is a 'catalytic converter'.
(b) A catalytic converter converts the harmful gases from the exhaust of vehicles into harmless gases. For example, it converts carbon monoxide into carbon dioxide, and nitrogen oxide into nitrogen gas.