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2 marksAcids, Bases and Salts

CSEC Chemistry · January 2012 · Paper 2 · Question 4(a)(iii)

Element Y and sulphur react with oxygen gas to form oxides. Both of these oxides are soluble in water to form colourless solutions.

Give ONE test that can be used to distinguish the solution of the oxide of Element Y from the solution of the oxide of sulphur.

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Other parts of this question

  1. 4(a)(i)Write the electronic configuration of sodium and state a reason for its placement in Period 3.[2 marks]
  2. 4(a)(ii)a)Write a balanced equation for the reaction of sodium with water.[2 marks]
  3. 4(a)(ii)b)Outline ONE test that can be used to identify any gas that is produced during the reaction.[2 marks]
  4. 4(a)(ii)c)Predict the reactivity of X with water as compared with sodium and potassium.[1 mark]
  5. 4(b)(i)Write a balanced IONIC equation for the overall reaction, and identify the species being oxidised and reduced.[4 marks]
  6. 4(b)(ii)Account for the difference in reactivity of chlorine and iodine towards iron(II).[2 marks]

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