Sodium Hydroxide Test

Sodium Hydroxide Test Quiz

Spec 3.4.3 · Oxford AQA IGCSE Chemistry: Quiz

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5 questions, one answer each

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  1. 1. What colour precipitate do copper(II) ions give with sodium hydroxide solution?

    • A. Green
    • B. Blue
    • C. Brown
    • D. White

  2. 2. Which metal ions all give a white precipitate with sodium hydroxide?

    • A. Copper, iron(II) and iron(III)
    • B. Aluminium, calcium and magnesium
    • C. Sodium, potassium and lithium
    • D. Iron(II) and iron(III) only

  3. 3. How can aluminium ions be distinguished from calcium and magnesium ions after all three give a white precipitate?

    • A. Aluminium hydroxide dissolves in excess sodium hydroxide, the others do not
    • B. Aluminium hydroxide turns yellow over time
    • C. Only aluminium reacts with sodium hydroxide at all
    • D. Aluminium hydroxide is soluble in water even without excess NaOH

  4. 4. A student adds sodium hydroxide to an unknown solution and observes a brown precipitate. Which ion is most likely present?

    • A. Iron(II)
    • B. Iron(III)
    • C. Copper(II)
    • D. Aluminium

  5. 5. A student tests an unknown solution: it gives a white precipitate with sodium hydroxide, and this precipitate does not dissolve even after adding a large excess of sodium hydroxide. Which conclusion is best supported?

    • A. The ion present is definitely aluminium
    • B. The ion present is calcium or magnesium, not aluminium
    • C. The ion present is copper(II)
    • D. No metal ion is present in the solution

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