1) How do we test for carbonate ions? a) Add acid b) Add limewater c) Add silver nitrate 2) How do we test for sulphate ions? a) Add lime water. b) Add hydrochloric acid. c) Add barium chloride. 3) Which of these is an example of a halide ion? a) S- b) Br- c) O2- 4) What would we expect to see when we add barium chloride to sodium sulphate? a) Nothing will happen. b) A white precipitate formed. c) A white solution formed. 5) What solution do we add to test for the presence of halide ions? a) Nitric acid and silver nitrate solution b) Silver chloride solution c) Magnesium nitrate solution. d) Hydrochloric acid and silver nitrate solution 6) What is the colour of the precipitate silver iodide? a) White b) Cream c) Yellow 7) Why would there be no reaction when we test silver nitrate with fluoride? a) Fluoride ions are unreactive. b) Silver fluoride is a gas. c) Silver fluoride is soluble. 8) What colour flame is produced by lithium ions, Li+? a) crimson b) green c) yellow d) blue e) orange-red f) lilac 9) What colour flame is produced by sodium ions, Na+? a) crimson b) green c) yellow d) blue e) orange-red f) lilac 10) What colour flame is produced by copper ions, Cu2+? a) crimson b) green c) yellow d) blue e) orange-red f) lilac 11) What colour flame is produced by calcium ions, Ca2+? a) crimson b) green c) yellow d) blue e) orange-red f) lilac 12) What colour flame is produced by potassium ions, K+? a) crimson b) green c) yellow d) blue e) orange-red f) lilac 13) What colour precipitate is produced upon the addition of dilute HNO3 and AgNO3, if iodide ions, I-, are present? a) yellow b) cream c) white d) blue e) red-brown f) greenish slowly turning brown 14) What colour precipitate is produced upon the addition of dilute HNO3 and AgNO3, if bromide ions, Br-, are present? a) yellow b) cream c) white d) blue e) red-brown f) greenish slowly turning brown 15) What colour precipitate is produced upon the addition of dilute HNO3 and AgNO3, if chloride ions, Cl-, are present? a) yellow b) cream c) white d) blue e) red-brown f) greenish slowly turning brown 16) What colour precipitate is produced upon the addition of NaOH, if iron(II) ions, Fe2+, are present? a) yellow b) cream c) white d) blue e) red-brown f) greenish slowly turning brown 17) What colour precipitate is produced upon the addition of NaOH, if calcium ions, Ca2+, are present? a) yellow b) cream c) white d) blue e) red-brown f) greenish slowly turning brown 18) What colour precipitate is produced upon the addition of NaOH, if copper(II) ions, Cu2+, are present? a) yellow b) cream c) white d) blue e) red-brown f) greenish slowly turning brown 19) What colour precipitate is produced upon the addition of NaOH, if Iron (III) ions, Fe3+, are present? a) yellow b) cream c) white d) blue e) red-brown f) greenish slowly turning brown 20) What colour precipitate is produced upon the addition of NaOH, if aluminium ions, Al3+, are present? a) yellow b) cream c) white d) blue e) red-brown f) greenish slowly turning brown 21) What colour precipitate is produced upon the addition of NaOH, if magnesium ions, Mg2+, are present? a) yellow b) cream c) white d) blue e) red-brown f) greenish slowly turning brown 22) Al3+, Mg2+ and Ca2+ all produce a white precipitate with NaOH. Which of the three dissolves in excess NaOH? a) Al3+ b) Mg2+ c) Ca2+ 23) How can you distinguish between Mg2+ and Ca2+ precipitates? a) Flame test - Ca2+ gives orange-red flame, Mg2+ gives no colour b) Flame test - Ca2+ gives crimson flame, Mg2+ gives no colour c) Flame test - Ca2+ gives yellow flame, Mg2+ gives no colour

C12 Testing for ions quiz

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