The Halogens

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

  • Ag+ (aq) + Cl- (aq) -> AgCl (s)
  • 2Ca (s) + O2 (g) -> 2CaO (s)
  • Cl2 (aq) + H2O (l) -> HClO (aq) + HCl (aq)
  • Cl2 (aq) + 2Br- (a) -> 2Cl- (aq) + I2 (aq)
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2. What is meant by the 'oxidising power' of a Halogen?

  • A measure of the strength with which a halogen atom is able to attract and capture an electron to form a halide.
  • A measure of the strength between the outer electron and the nucleus.
  • The ease of a Halogen atom to lose its outer electrons.
  • The ease of a Halogen to attract another Halogen.

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 3 points explain the trend in reactivity down the group?

  • Atomic radius increases; Electron shielding decreases; Ability to gain an electron into the p sub-shell decreases to form a halide ion.
  • Atomic radius decreases; Electron shielding decreases; Ability to gain an electron into the p sub-shell increases to form a halide ion.
  • Atomic radius increases; Electron shielding increases; Ability to gain an electron into the p sub-shell decreases to form a halide ion.
  • Atomic radius decreases; Electron shielding increases; Ability to gain an electron into the p sub-shell increases to form a halide ion.

5. Which of these statements is false?

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

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