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Chemistry · May / June 2019 · Paper 11 · Question 20

5070Redox

Gas X turns acidified potassium manganate(VII) from purple to colourless. Gas Y turns aqueous potassium iodide from colourless to brown. What do these observations show about gas X and gas Y?

  1. Agas X: oxidising agent; gas Y: oxidising agent
  2. Bgas X: oxidising agent; gas Y: reducing agent
  3. Cgas X: reducing agent; gas Y: oxidising agent
  4. Dgas X: reducing agent; gas Y: reducing agent

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Correct answer: C. gas X: reducing agent; gas Y: oxidising agent

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