What this practice covers
These questions are drawn from past CIE 0620 Chemistry papers and filtered to air quality and climate. You answer, you find out immediately whether you were right, and you get the reasoning for the correct option and for each distractor. Wrong answers go to a mistakes locker so you can come back to exactly those.
Practice is free. You need an account only so your progress and your mistakes are still there next time.
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What examiners see students get wrong here
These are the errors that cost marks on air quality and climate, taken from our own topic notes. Read them before you practise and you will recognise the traps in the questions.
- Quoting the composition of air as 79% nitrogen and 20% oxygen. The figures wanted are 78% and 21%.
- Giving carbon dioxide as a product of incomplete combustion. Incomplete combustion gives carbon monoxide and particulates.
- Saying oxides of nitrogen come from nitrogen in the fuel. They come from the nitrogen in the air, forced to react by the heat of the engine.
- Naming carbon dioxide as a cause of acid rain. Acid rain is caused by sulfur dioxide and oxides of nitrogen.
- Saying carbon monoxide causes acid rain, or that sulfur dioxide is a greenhouse gas.
- Writing that greenhouse gases stop the Sun's radiation getting in. They absorb the outgoing thermal radiation from the surface.
- Claiming a catalytic converter removes carbon dioxide.
Revise it first
If any of the above is unfamiliar, work through the notes before practising: Air quality and climate revision notes.