G2 Science (Chemistry) Maintaining Air Quality · question set

Try K223/K225 environmental exam-style questions. Covers composition evidence, prescribed source–pollutant–effect–control chains, carbon-cycle transfers, and natural versus enhanced greenhouse reasoning, including mixed-model discrimination.

SEC G2 Science Chemistry component 2027

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What is the approximate composition of dry air by volume?

78% nitrogen and 21% oxygen
78% oxygen and 21% nitrogen
50% nitrogen and 50% oxygen
99% carbon dioxide and 1% oxygen

Which gases make up most of the small remainder after nitrogen and oxygen in dry air?

Noble gases and carbon dioxide
Hydrogen and chlorine
Methane and sulfur dioxide
Carbon monoxide and ammonia

Which list contains only pollutants named in the Maintaining Air Quality syllabus?

$\ce{CO}$, $\ce{CH4}$, nitrogen oxides and $\ce{SO2}$
$\ce{N2}$, $\ce{O2}$, argon and neon
$\ce{H2}$, helium, steam and sodium chloride
Oxygen, methane, nitrogen and carbon dioxide

Which pair gives two sources of nitrogen oxides?

High-temperature engines and lightning
Cattle and landfills
Photosynthesis and respiration
Fractional distillation and electrolysis

Which statement about acid rain is correct?

Sulfur dioxide and nitrogen oxides contribute to it, and it can damage limestone
Carbon monoxide is its only cause
It raises lake pH and protects aquatic life
It is caused by noble gases reacting with water

Gas Q is released by incomplete combustion and is poisonous. Which gas is Q?

Carbon monoxide
Carbon dioxide
Methane
Ozone

Which carbon-cycle process removes carbon dioxide from the atmosphere?

Photosynthesis
Respiration
Combustion
Complete decomposition

Which two processes add carbon dioxide to the atmosphere?

Combustion and respiration
Photosynthesis and condensation
Photosynthesis and respiration
Combustion and photosynthesis

Which pair consists of the two greenhouse gases required by this syllabus objective?

Carbon dioxide and methane
Nitrogen and oxygen
Ozone and argon
Carbon monoxide and helium

Which is a source of methane?

Decay of organic waste
Photosynthesis
Fractional distillation of air
Neutralisation of an acid

Which is a possible effect of global warming?

Rising sea level and flooding of low-lying areas
Less ultraviolet radiation because more ozone forms
All rainfall stops everywhere
Dry air becomes 100% oxygen

Atmospheric $\ce{CO2}$ increases while the combustion rate is unchanged. Which change could explain the increase?

A decrease in photosynthesis
An increase in photosynthesis
A decrease in respiration
More carbon dioxide being removed from air

G2 Science (Chemistry) Maintaining Air Quality · question set

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