The Halogens

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1. In a displacement reaction, in the order of Cl2, Br2 and I2, what are the colour of the halogens in cyclohexane?

  • Pale-green, Brown, Violet
  • Orange, Pale-green, Violet
  • Pale-green, Orange, Violet
  • Pale-green, Orange, Brown
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2. How many electrons are in the outer p sub-shell of a Group 7 element?

  • 5
  • 6
  • 7
  • 2

3. Which of these is an example of a disproportionation reaction?

  • Ag+ (aq) + Cl- (aq) -> AgCl (s)
  • Cl2 (aq) + H2O (l) -> HClO (aq) + HCl (aq)
  • Cl2 (aq) + 2Br- (a) -> 2Cl- (aq) + I2 (aq)
  • 2Ca (s) + O2 (g) -> 2CaO (s)

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

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

5. What solution is added to a halide solution to detect the presence of halide ions?

  • Nitric Acid (HNO3).
  • Cyclohexane (C6H12).
  • Aqueous solution of Silver Nitrate (AgNO3).
  • Aqueous Solution of Hydrochloric Acid (HCl).

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