Question on: JAMB Chemistry - 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 Option: C

The oxidization of iodide (by chlorine) ion produces the iodine which attacks the starch to give the blue-black colour

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