Air

Question 1

what is the percentage of nitrogen in the composition of dry air?

Answer 1

78%

Question 2

what is the percentage of oxygen in the composition of dry air?

Answer 2

21%

Question 3

what is the percentage of argon, carbon dioxide and noble gas in the composition of dry air?

Answer 3

<1%

Question 4

what are the three air pollutants?

Answer 4

carbon monoxide
nitrogen oxides
sulfur dioxide

Question 5

what are the sources of carbon monoxide?

Answer 5

• forest fires

- incomplete combustion of fuels in motor vehicles, factories and power stations

Question 6

what is the effect of carbon monoxide?

Answer 6

is poisonous and binds irreversibly with haemoglobin which prevents oxygen from being transported throughout the body

Question 7

what are the sources of nitrogen oxides?

Answer 7

• forest fires
• lighting activities
• internal combustion of engines

Question 8

what is the effect of nitrogen oxides?

Answer 8

the gases react with oxygen and rainwater to form acid rain which corrodes buildings and harms aquatic life and plants

Question 9

what are the sources of sulfur dioxide?

Answer 9

• burning of fossil fuels containing sulfur impurities in power stations, petrol refineries and industries
• volcanic activities

Question 10

what is the effect of sulfur dioxide?

Answer 10

the gases react with oxygen and rainwater to form acid rain which corrodes buildings and harms aquatic life and plants