Chemistry 5070 · O Level · Identification of ions and gases
Identification of ions and gases — practice question
Select the gases to respond to the questions.
argon
carbon dioxide
carbon monoxide
ethane
hydrogen
methane
neon
ozone
sulfur dioxide
sulfur trioxide
You may use each gas one time, more than once, or not use it at all.
(a)[1]
Which gas is employed in the production of margarine?
(b)[1]
Which gas acts as a food preservative?
(c)[1]
Which gas has molecules containing only eight atoms?
(d)[1]
Which gas is produced by bacterial decay of vegetable matter?
(e)[1]
Which gas is produced in photochemical smog?
(f)[1]
Which gas undergoes complete combustion to give only a gas that makes limewater turn milky?
Worked solution & mark scheme
This 6-mark question has a full step-by-step worked solution and mark scheme. One marking point: “hydrogen gas” …