Question

Explain why chlorine turns moist starch iodide paper blue black

Answer 1

chlorine oxidises iodide to iodine ,which shows up as blue when complexed with starch

Answer 2

Chlorine turns moist starch iodide paper blue black

Explanation:

• Chlorine turns moist starch iodide paper blue-black because the iodide ions on the paper are oxidized to iodine and the starch react to it to give blue-black compound.

                             $Cl_2 + 2I^- \rightarrow I_2 + 2Cl^-$

                    $I_2 + starch \rightarrow Blue black compund$

• Iodine is the least reactive of the halogens as well as the most electropositive, meaning it tends to lose electrons and form positive ions during chemical reactions.

• An iodide ion is the ion I−. Compounds with iodine in formal oxidation state −1 are called iodides.

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