Lesson 3.2.6

3.2.6 Reactions of ions in aqueous solution Quiz: AQA Chemistry, Unit 2

20 questions

Written by Revision Ninja · Last reviewed 11 October 2026

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Lesson 3.2.6, Reactions of ions in aqueous solution: 20 multiple choice questions for the AQA Chemistry (7405), Unit 2: Inorganic chemistry, written with Revision Ninja.

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The 20 questions

  1. Which metal-aqua ions are formed in aqueous solution for Fe and Cu in the 2+ state?

    • [Fe(OH)6]2+ and [Cu(OH)6]2+
    • [Fe(H2O)4]2+ and [Cu(H2O)4]2+
    • [Fe(H2O)6]3+ and [Cu(H2O)6]3+
    • [Fe(H2O)6]2+ and [Cu(H2O)6]2+

  2. Which metal-aqua ion is formed by aluminium in aqueous solution?

    • [Al(H2O)6]2+
    • [Al(H2O)6]3+
    • [Al(H2O)4]3+
    • [Al(OH)6]3-

  3. Which aqua ion is more acidic in aqueous solution: [Fe(H2O)6]3+ or [Fe(H2O)6]2+?

    • Neither is acidic
    • They are equally acidic
    • [Fe(H2O)6]3+
    • [Fe(H2O)6]2+

  4. Why is [Al(H2O)6]3+ more acidic than a 2+ aqua ion of similar size?

    • Al3+ has no effect on the water ligands at all
    • Al3+ has a lower charge/size ratio, so its water ligands are less polarised
    • Al3+ has a higher charge/size ratio, which polarises the O-H bonds in the water ligands more
    • 2+ ions always release more H+ than 3+ ions

  5. Which metal hydroxide is amphoteric?

    • Ca(OH)2
    • NaOH
    • Al(OH)3
    • Mg(OH)2

  6. What is observed when NaOH(aq) is added to Fe2+(aq)?

    • A green precipitate of Fe(OH)2 forms
    • A blue precipitate forms
    • A white precipitate that dissolves in excess
    • No change is seen

  7. What is observed when NaOH(aq) is added to Fe3+(aq)?

    • A red-brown precipitate of Fe(OH)3 forms
    • A colourless solution forms
    • A green precipitate forms
    • A white precipitate that dissolves in excess

  8. What is observed when NaOH(aq) is added to Cu2+(aq)?

    • A red precipitate of copper metal
    • A pale blue precipitate of Cu(OH)2 forms
    • A white precipitate of CuCO3 only
    • A green precipitate that dissolves in excess

  9. What is observed when NaOH(aq) is added to Al3+(aq) until in excess?

    • A red-brown precipitate that stays in excess
    • No precipitate forms at any stage
    • A white precipitate forms and then dissolves in excess NaOH
    • A green precipitate that stays in excess NaOH

  10. Which ion is formed when aluminium hydroxide dissolves in excess NaOH?

    • [Al(H2O)6]3+
    • Al3+
    • [Al(OH)4]-
    • AlO2^3+

  11. What is observed when Na2CO3(aq) is added to Al3+(aq)?

    • A white precipitate forms with bubbles of carbon dioxide
    • A green precipitate forms with no gas
    • A blue precipitate and a gas that relights a splint
    • No reaction is observed

  12. What is observed when Na2CO3(aq) is added to Fe2+(aq)?

    • A red-brown precipitate forms with bubbles
    • A blue precipitate forms
    • A colourless solution forms with no precipitate
    • A green precipitate forms

  13. What is observed when NH3(aq) is added to Cu2+(aq) in excess?

    • No change is seen at any stage
    • A green precipitate forms that stays in excess
    • A white precipitate forms that dissolves in excess
    • A pale blue precipitate forms, which dissolves to give a deep blue solution

  14. Which result shows that Fe3+(aq) is more acidic than Fe2+(aq)?

    • Fe3+ produces an acidic reaction with carbonate, releasing CO2, while Fe2+ does not
    • Fe2+ dissolves in NaOH but Fe3+ does not
    • Fe3+ is a green solution and Fe2+ is yellow
    • Fe2+ reacts with NH3 to form a blue complex

  15. Which of these is a correct test-tube observation for aluminium ions and sodium hydroxide?

    • A deep blue solution forms immediately
    • A white precipitate is formed, which dissolves in excess sodium hydroxide
    • A green precipitate forms and turns brown in excess
    • A red-brown precipitate forms that is insoluble in excess

  16. Which of these metal ions gives a green precipitate with NaOH(aq)?

    • Al3+
    • Fe2+
    • Cu2+
    • Fe3+

  17. Which equation represents the reaction of Al(OH)3 with excess NaOH?

    • Al(OH)3 + H+ -> [Al(OH)2]+ + H2O
    • Al(OH)3 + Na+ -> NaAl(OH)3
    • Al(OH)3 + OH- -> [Al(OH)4]-
    • Al(OH)3 + 3OH- -> Al3+ + 3H2O

  18. Which reagent gives a deep blue solution in excess when added to Cu2+(aq)?

    • Dilute HCl(aq)
    • NaCl(aq)
    • NH3(aq)
    • Na2CO3(aq)

  19. What is observed when Na2CO3(aq) is added to Fe3+(aq)?

    • A green precipitate forms with no bubbles
    • A red-brown precipitate forms with bubbles of carbon dioxide
    • A blue solution forms with no precipitate
    • A white precipitate that dissolves in excess

  20. Which reagent distinguishes Fe2+ from Fe3+ in aqueous solution by the colour of the precipitate?

    • H2SO4(aq)
    • NaOH(aq)
    • AgNO3(aq)
    • Br2(aq)

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