Chemistry 5070 · O Level · Identification of ions and gases
Identification of ions and gases — practice question
Select one salt from the list below to answer the questions.
aluminium chloride
barium sulfate
calcium chloride
copper(II) sulfate
magnesium chloride
potassium iodide
potassium manganate(VII)
silver nitrate
sodium bromide
sodium sulfite
Each salt may be used once, more than once, or not used at all.
State which salt should be chosen:
(a)[1]
is produced by a precipitation reaction.
(b)[1]
in aqueous solution, gives a dark blue solution when excess aqueous ammonia is added.
(c)[1]
reacts with warm aqueous sodium hydroxide and aluminium foil to produce a gas that turns damp red litmus paper blue.
(d)[1]
has an aqueous solution that can be used to check for an oxidising agent.
(e)[1]
has an aqueous solution that will react with copper metal.
Worked solution & mark scheme
This 5-mark question has a full step-by-step worked solution and mark scheme. One marking point: “$\text{BaSO}_4$” …