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The Proportions Of Different Gases In The Atmosphere (GCSE Chemistry)

The following is a GCSE Chemistry test covering 'The Proportions Of Different Gases In The Atmosphere' from the broader topic Chemistry Of The Atmosphere. The test is geared towards the AQA exam board style syllabus.
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Which gas in the troposphere can be directly harmful to human health at high concentrations and is produced by incomplete combustion of fossil fuels?
Which statement best describes the current trend in global atmospheric CO2 concentration over the past century?
Which process removes carbon dioxide from the atmosphere and stores it in plant material?
Which gas makes up about 78% of the Earth’s dry atmosphere by volume?
Which of the following is a natural sink for atmospheric carbon dioxide?
What is the typical concentration (approximate) of argon in dry air?
Which gas is the largest proportion of dry air but is largely unreactive and does not support combustion?
Which pollutant gas contributes to acid rain and primarily comes from burning fossil fuels containing sulfur?
Which gas is a major greenhouse gas present in the atmosphere at roughly 0.04% (400 ppm)?
Which gas in the atmosphere is essential for combustion and respiration?
Approximately what percentage of the atmosphere is oxygen?