The Halogens

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1. In a displacement reaction, in the order of Cl2, Br2, I2, what are the colours of the halogens in water?

  • Pale-green, Brown, Violet
  • Orange, Pale-green, Violet
  • Pale-green, Orange, Brown
  • Pale-green, Orange, Violet
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2. In a displacement reaction, in the order of Cl2, Br2 and I2, what are the colour of the halogens in cyclohexane?

  • Pale-green, Orange, Violet
  • Pale-green, Orange, Brown
  • Pale-green, Brown, Violet
  • Orange, Pale-green, Violet

3. What is 'Disproportionation'?

  • A reaction in which an element is reduced.
  • A reaction in which the same element is both reduced and oxidised.
  • A reaction in which an element is oxidised.
  • A reaction in which an element is neither reduced or oxidised.

4. What is formed when a Group 7 element reacts with a metal?

  • Ionic halide with an X- ion.
  • Ionic halide with an X+ ion.
  • Covalent halide with an X- ion.
  • Metallic halide with an X+ ion.

5. How many electrons are in the outer p sub-shell of a Group 7 element?

  • 2
  • 5
  • 7
  • 6

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