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5 marksQualitative Analysis

CSEC Chemistry · January 2010 · Paper 2 · Question 5(a)

Hydrogen, chlorine and nitrogen are diatomic gases. Chemical tests (lighted splint, moist litmus) can distinguish them.

Explain how the tests above can be used to distinguish among the gases, hydrogen, chlorine and nitrogen. Include observations in your answer.

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Other parts of this question

  1. 5(b)(i)Explain what occurs at the anode and the cathode in the electrolysis of brine.[4 marks]
  2. 5(b)(ii)Write an ionic equation for the reaction which occurs at the anode.[2 marks]
  3. 5(b)(iii)Suggest why brine is used instead of dilute sodium chloride. Give an equation to justify your answer.[4 marks]

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