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2 marksGroup VII Elements

CAPE Chemistry Unit 1 · 2012 · Paper 2 · Question 3(b)(i)

A student was provided with three test tubes, EACH containing one hydrogen halide. A red hot wire (exceeding 300 °C) was quickly placed into each test tube in turn. The observations were recorded in Table 2. Test Tube I: Hydrogen chloride, No change. Test Tube II: Hydrogen bromide, Slight brown colouration seen. Test Tube III: Hydrogen iodide, Copious violet fumes seen.

Identify the gases observed in Test Tube II and Test Tube III.

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Other parts of this question

  1. 3(a)(i)Describe the reaction of Fluorine with hydrogen.[3 marks]
  2. 3(a)(ii)Describe the reaction of Chlorine with hydrogen.[3 marks]
  3. 3(a)(iii)Describe the reaction of Bromine with hydrogen.[3 marks]
  4. 3(b)(ii)Write a balanced equation to represent the reaction occurring in Test Tube II.[2 marks]
  5. 3(b)(iii)Using the relevant information provided in the data booklet, explain the trend in the observations recorded in Table 2.[2 marks]
  6. 3(b)(iv)What would you observe if hydrogen fluoride was used in the experiment?[1 mark]
  7. 3(c)(i)State what would be observed in the case of sodium chloride.[1 mark]
  8. 3(c)(ii)State what would be observed in the case of sodium bromide.[2 marks]
  9. 3(d)The products of the reaction in (c) (i) above were passed into water and the resultant solution treated with AgNO3(aq) followed by aqueous ammonia. State what…[2 marks]

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