Chemistry 5070 · O Level · Identification of ions and gases
Identification of ions and gases — practice question
Use the list of compounds below to answer these questions.
calcium oxide
carbon dioxide
carbon monoxide
lead chloride
propan-1-ol
sodium nitrate
sodium sulfate
sulfur dioxide
water
Each compound can be used once, more than once, or not at all.
Identify the compound that:
(a)[1]
is the poisonous gas made when carbon-containing compounds undergo incomplete combustion.
(b)[1]
changes anhydrous copper(II) sulfate into its blue hydrated form.
(c)[1]
causes deoxygenation of water in rivers.
(d)[1]
in aqueous solution, produces a white precipitate when acidified aqueous barium chloride is added.
(e)[1]
has an anion whose charge is $-1$.
Worked solution & mark scheme
This 5-mark question has a full step-by-step worked solution and mark scheme. One marking point: “carbon monoxide ($\text{CO}$)” …