Chemistry 0620 · IGCSE · Identification of ions and gases
Identification of ions and gases — practice question
The substances listed below are given.
barium nitrate
carbon monoxide
hydrated cobalt(II) chloride
copper(II) oxide
anhydrous copper(II) sulfate
ethane
potassium iodide
propene
sodium bromide
sulfur dioxide
zinc oxide
Use only the substances from this list to answer the questions that follow.
Each substance may be chosen once, more than once, or not chosen at all.
(a)[1]
State the name of the substance that gives a lilac flame in a flame test.
(b)[1]
Give the name of the substance whose aqueous solution produces a cream precipitate when it reacts with acidified aqueous silver nitrate.
(c)[1]
Give the name of the substance that is an acidic oxide.
(d)[1]
Give the name of the substance that is an unsaturated hydrocarbon.
(e)[1]
Give the name of the substance that is formed during the incomplete combustion of fossil fuels.
(f)[1]
Give the name of the substance used to test for the presence of water.
Worked solution & mark scheme
This 6-mark question has a full step-by-step worked solution and mark scheme. One marking point: “$\text{KI}$” …