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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
Explanation
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Explanation Video

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Post-UTME Past Questions - Original materials are available here - Download PDF for your school of choice + 1 year SMS alerts
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WAEC May/June 2024 - Practice for Objective & Theory - From 1988 till date, download app now - 99995
WAEC Past Questions, Objective & Theory, Study 100% offline, Download app now - 24709
Post-UTME Past Questions - Original materials are available here - Download PDF for your school of choice + 1 year SMS alerts
WAEC May/June 2024 - Practice for Objective & Theory - From 1988 till date, download app now - 99995
WAEC offline past questions - with all answers and explanations in one app - Download for free
WAEC Past Questions, Objective & Theory, Study 100% offline, Download app now - 24709