Identification of Ions and Gases

Identification of Ions and Gases Quiz

Spec 12.5 · Cambridge IGCSE Chemistry: Quiz

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5 questions, one answer each

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  1. 1. Which gas is identified by turning a glowing splint bright orange or relighting it?

    • A. Oxygen
    • B. Hydrogen
    • C. Carbon dioxide
    • D. Ammonia

  2. 2. When testing for chloride ions, which sequence of reagents should be added?

    • A. Aqueous sodium hydroxide, then aqueous silver nitrate
    • B. Dilute nitric acid, then aqueous silver nitrate
    • C. Aqueous potassium manganate(VII), then dilute hydrochloric acid
    • D. Dilute sulfuric acid, then aqueous barium nitrate

  3. 3. A solution produces a blue-green flame when held in a Bunsen burner. Which cation is present?

    • A. Sodium
    • B. Potassium
    • C. Copper(II)
    • D. Calcium

  4. 4. To identify nitrate ions in a solution, you add aqueous sodium hydroxide and aluminium foil, then warm the mixture. What would be observed if nitrate ions are present?

    • A. A white precipitate forms immediately
    • B. The solution turns pink
    • C. A pungent gas with a sharp smell is released that turns damp red litmus paper blue
    • D. A colourless gas is evolved that relights a glowing splint

  5. 5. A student tests a solution with aqueous sodium hydroxide and observes a precipitate that initially forms but then dissolves as more sodium hydroxide is added. Which two cations could produce this observation?

    • A. Copper(II) and iron(III)
    • B. Aluminium and zinc
    • C. Calcium and copper(II)
    • D. Iron(II) and chromium(III)

Quiz