Air quality and air pollution

Which of these gases makes up the largest proportion of the Earth's atmosphere today ?

• Oxygen

• CO₂

• SO₂

• Nitrogen

What percentage of the atmosphere is oxygen?

• 12%

• 21%

• 28%

• 32%

Which process of the carbon cycle does not release CO₂

• Combustion

• Photosynthesis

• Respiration

• Decay

Which of these molecules is not an air pollutant?

• NO₂

• Oxygen

• CO

• SO₂

Why could it be dangerous to exercise outside during high levels of air pollution?

• Exercise is bad for health

• Deep breathing during exercise allows toxins further into the lungs

• Pollutants can attack the fibre of clothes

• Pollution makes surface slippery causing accidents

Which of these is produced by incomplete combustion?

• CO₂

• CO

• Nitrogen

• SO₂

Which molecules combines with water vapour to form acid rain?

• Nitrogen & CO

• Helium & SO₂

• SO₂ & NO

• Oxygen and Argon

Which of these methods would not reduce air pollution

• Reducing the use of fossil fuels

• Filtering fossil fuel emissions

• Removing sulphur from coal before combustion

• Burning wood instead of fossil fuels

What products are formed during the reactions of a catalytic converter

• Carbon monoxide, Oxygen and water

• Nitrogen, sulphur and carbon

• Carbon dioxide, nitrogen and oxygen

• Carbon dioxide, nitrogen dioxide and water

What are the functions of the catalytic converter?

• oxidise oxides of nitrogen to nitrogen

• oxidise carbon monoxide to carbon dioxide

• convert unburnt hydrocarbon to carbon dioxide and water