The Halogens

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1. What are the strucural properties of a Group 7 element?

  • Metallic, Strong van der Waals' forces between diatomic molecules.
  • Giant covalent; Weak van der Waals' forces between diatomic molecules.
  • Simple molecular; Weak van der Waals' forces between diatomic molecules.
  • Giant ionic, Strong van der Waals' forces between diatomic molecules.
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2. Which of these is an example of a disproportionation reaction?

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

3. 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
  • Orange, Pale-green, Violet
  • Pale-green, Orange, Brown
  • Pale-green, Brown, Violet

4. Which of these statments is true?

  • Halogens bond to form a covalent diatomic molecule, X2.
  • Halogens bond to form an ionic diatomic molecule, X2-.
  • Halogens bond to form an ionic diatomic molecule, X2+.
  • Halogens do not bond.

5. Which of these statements is false?

  • Bromide reacts with Silver Nitrate to form a cream precipitate which is soluble in concentrate ammonia - NH3 (aq).
  • Iodide reacts with Silver Nitrate to form a yellow precipitate that is soluble in concentrate ammonia - NH3.
  • Chloride reacts with Silver Nitrate to form a white precipitate which is soluble in dilute ammonia - NH3 (aq).
  • Iodide reacts with Silver Nitrate to form a yellow precipitate which is insoluble in concentrate ammonia - NH3 (aq).
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