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1 markStructure and Formulae

CAPE Chemistry Unit 2 · 2006 · Paper 2 · Question 2(a)(ii)

The reaction products between chlorine and aqueous sodium hydroxide depend on temperature and concentration, and chlorine exhibits variable oxidation states.

Calculate the oxidation number of chlorine in NH₄ClO₄.

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Other parts of this question

  1. 2(a)(i)Write a balanced equation for the reaction occurring when chlorine is bubbled through cold aqueous dilute sodium hydroxide.[2 marks]
  2. 2(b)(i)State the observation when aqueous chlorine is added to aqueous potassium bromide and the mixture is shaken.[1 mark]
  3. 2(b)(ii)State the observation when aqueous silver nitrate is added to a sample of aqueous sodium chloride followed by ammonia solution.[2 marks]
  4. 2(b)(iii)State the observation when warm concentrated sulphuric acid is added to solid potassium iodide.[1 mark]
  5. 2(c)Write an ionic equation for the reaction occurring in (b)(i).[2 marks]
  6. 2(d)What precaution must be taken when performing the reaction in (b)(iii) in the laboratory?[1 mark]

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