First slide

Air Pollution and its Control

Question

Catalytic converters reduce vehicular pollution by converting

Moderate

A

Carbon dioxide into carbon monoxide
B

Nitrogen gas into nitrogen oxides
C

Hydrocarbons into $C O_{2} a n d H_{2} O$
D

Nitrogen oxides into PAN

Solution

Catalytic converters convert CO into $C O_{2}$ , nitrogen oxides into nitrogen gas and hydrocarbons into $C O_{2}$ and $H_{2} O$ .
The major reactions in a catalytic converter:
$C O + ½ O_{2} \to C O_{2} C_{2} H_{4} + 3 O_{2} \to 2 C O_{2} + 2 H_{2} O C O + N O_{x} \to C O_{2} + N_{2}$

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