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Group-17 or Halogen family

Which one of the following halogens turn(s) starch iodide paper blue?


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

The bromine releases iodine from the potassium iodide. Iodine reacts with starch to produce a blue color.

Br2​+2KI → 2KBr+I2​

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