AIR AND ENVIRONMENT

Question 1

What are the common air pollutants?

Answer 1

1. CO
2. SO2
3. NO2/NO
4. CH4 and unburnt hydrocarbons

Question 2

How do NO2 and SO2 cause acid rain?

Answer 2

SO2 + H20 > H2SO3

4NO2 + 2H2O + O2 > 4HNO3

Question 3

How do catalytic converters work?

Answer 3

Hot exhaust gases containing CO, NO/NO2 and unburnt hydrocarbons are passed over platinum and rhodium catalyst.
CO + O2 > CO2
2NO + 2CO > N2 + CO2
Unburnt hydrocarbons are combusted again.

Question 4

How is SO2 removed?

Answer 4

SO2 is passed over CaCO3