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Which process(es) is/are involved in the turning of…

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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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C

SOLUTION 

When chlorine gas is bubbled into starch iodide paper, chlorine ions displaces iodine ions which in turn reacts with the starch to form a dark-blue complex.

Now for the right answer to the above question:

  1. Option A is incorrect. the chlorine will not directly attack the starch.
  2. Option B is incorrect. iodine in itself is not blue-black in color, even if the chlorine displaces it from a compound, it is not enough to give the color changes.
  3. C is correct. The displaced iodine must have attacked the starch to give the blue-black color.
  4. D is not the correct answer. The iodine must firstly be displaced from the paper in order to freely attack the starch.
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You may please note these/this:

  • When a more powerful oxidizing agent like chlorine collides with a compound containing a less powerful oxidizing agent like iodine, the former oxidizes and displaces the latter.

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/culled from 2019 JAMB-UTME Chemistry question 14/

Which process(es) is/are involved in the turning of... » QuizTablet
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