Question

The pollutant gas CO is also found in the exhaust gases from petrol engines. Explain how CO and NO are removed from the exhaust gases and why the removal of each of them is desirable.

Answer 1

You can remove NO by O2 and
H2O
2NO+O2--->2NO2
2H2O+4NO2+O2--->4HNO3

You can remove by
NO
NO+CO--->N2 + CO2