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6. Which of these observations indicates the presence of aluminium ions?

  • A white precipitate that dissolves in excess NaOH
  • A light blue precipitate
  • Aluminium metal forming at the bottom of the test tube

7. What colour is phenolphthalein when nothing has been added?

  • Colourless
  • Pink
  • Red

8. To test for aluminium ions, which alkali is added?

  • Lithium hydroxide
  • Sodium hydroxide
  • Hydrochloric acid

9. What colour is Methyl Orange in acid?

  • Orange
  • Colourless
  • Red

10. What colour flame do potassium ions produce?

  • Brick red
  • Lilac
  • Orange - yellow

11. Red litmus paper turns blue in ______

  • Bases
  • Acids

12. What colour flame do calcium ions produce?

  • Blue
  • Brick red
  • Lilac

13. Which colour precipitate will iron (II) produce when NaOH is added?

  • A white suspension
  • A dark green precipitate
  • A brown precipitate

14. What colour flame do copper ions produce?

  • Brown - orange
  • Green
  • Blue

15. What is methyl orange used for?

  • Neutralising acidic solutions
  • Titrations with a strong acid and weak base
  • Titrations with a weak base and strong acid

16. What colour is phenolphthalein when a base is added?

  • Orange
  • Pink
  • Colourless

17. Will iron (II) produce a different coloured precipitate to iron (III) ?

  • Yes
  • No

18. What is the test for ammonium ions?

  • Gently heat the test tube and test the gas given off with moist red litmus paper. It should go blue.
  • Add methyl orange and it will go colourless if ions are present
  • Add phenolphthalein and it will turn pink if ions are present

19. What colour flame do sodium atoms produce?

  • Lilac
  • Orange - yellow
  • Brick red

20. If calcium ions are present, what will you see when NaOH is added?

  • A white suspension
  • A light blue precipitate
  • A brick red precipitate