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 ?

(a) Catalyltic converter- A catalytic converter is an emissions control device that converts toxic gases and pollutants in exhaust gas to less toxic pollutants by catalyzing a redox reaction (an oxidation and a reduction reaction)

(b) It helps in controlling air pollution by changing poisonous carbon monoxide into non-poisonous carbon dioxide and also converts harmful nitrogen oxides into harmless nitrogen gas.