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Which process(es) is/are involved in the turning of starch iodide paper blue-black by chlorine gas?

Chemistry
JAMB 2019

Which process(es) is/are involved in the turning of starch iodide paper blue-black by chlorine gas?

  • A. chlorine attacks the starch to give the blue-black color
  • B. chlorine attacks the iodide ion to give the blue-black color
  • C. chlorine oxidizes the iodide ion to produce iodine which attacks the starch to give the blue-black color
  • D. iodine attacks the starch to give the blue-black color
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Correct Answer: Option C
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