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2 marksGroup VII Elements

CAPE Chemistry Unit 1 · 2009 · Paper 2 · Question 6(c)(ii)

Chlorine forms a colourless solution, P, when dissolved in cold sodium hydroxide. This reaction, which is represented by the reaction below, is referred to as a disproportionation. Cl2(g) + 2OH-(aq) ⇌ Cl-(aq) + ClO-(aq) + H2O(l)

A suspension is formed when excess silver ions (Ag+) are added to Solution P. On filtering the suspension and heating the filtrate a white precipitate is formed. Given the fact that the filtrate contains both Ag+ and ClO- ions, account for the presence of the white precipitate on heating.

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Other parts of this question

  1. 6(a)Define the term 'electronegativity'.[1 mark]
  2. 6(b)(i)Describe the structures of the chlorides.[2 marks]
  3. 6(b)(ii)Describe the differences in the pH of the solutions formed when the chlorides react with water.[2 marks]
  4. 6(b)(iii)Write the equation for the reaction of silicon(IV) chloride and water.[2 marks]
  5. 6(c)(i)What is meant by the term 'disproportionation'?[1 mark]
  6. 6(d)(i)Identify the substances, T, U and V.[3 marks]
  7. 6(d)(ii)Write the formula for the ion present in S.[1 mark]
  8. 6(d)(iii)Write the equation for the formation of the cream precipitate, V.[1 mark]

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