row pollutant main source 1 carbon monoxide lightning in clouds 2 methane burning of coal impurities 3 sulfur dioxide reaction of N₂ and O₂ in engines 4 car...
Question 1 Report
| row | pollutant | main source |
|---|---|---|
| 1 | carbon monoxide | lightning in clouds |
| 2 | methane | burning of coal impurities |
| 3 | sulfur dioxide | reaction of N₂ and O₂ in engines |
| 4 | carbon monoxide | incomplete combustion of fuels |
The table gives four pollutant gases and how each is mainly formed. A student must choose the row where the pollutant is matched to the correct source. Which row is correct?
Answer Details
Row 4 is correct: carbon monoxide comes from the incomplete combustion of fuels, when there is too little oxygen to oxidise all the carbon to CO2.
The other rows have real sources attached to the wrong gas. Lightning in clouds provides enough energy to make oxides of nitrogen, not carbon monoxide. Burning sulfur impurities in coal gives sulfur dioxide, not methane; methane comes from decay, landfill sites and livestock. The reaction of N2 with O2 in hot engines makes oxides of nitrogen, not sulfur dioxide. Learning each pollutant with its own origin stops these scrambled pairings catching you out.
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