Atmosphere and environment 2

Which method of water purification can be used to obtain drinkable water from seawater?

• chlorination

• desalination

• filtration

• sedimentation

When volcano erupts, which gas is produced in significant amounts?

• carbon monoxide

• methane

• ozone

• sulfur dioxide

What is not essential for photosynthesis?

• carbon dioxide

• sugar

• light

• water

Which of these processes can be used to purify water containing insoluble impurities?

1 chlorination

2 desalination

3 distillation

4 filtration

• 1 and 2

• 2 and 3

• 3 and 4

• 4 only

Which gas will react with ozone in the upper atmosphere of the Earth?

• CF₂Cl₂

• CH₄

• CO₂

• SO₂

The noble gases, argon, helium, krypton and xenon, are present in air.

Which noble gas is present in the largest proportion?

• argon

• helium

• krypton

• xenon

Which gas is most likely to react with limestone?

• ammonia

• carbon monoxide

• methane

• sulfur dioxide

Which row shows both the correct source and the correct effect of the named pollutant?

• A

• B

• C

• D

Which gas can be removed from the exhaust gases of a petrol-powered car by its catalytic converter?

• carbon monoxide

• carbon dioxide

• nitrogen

• steam

Salt containing which of the following anions are always soluble in water?

• carbonates

• chlorides

• nitrates

• sulfates