First slide

Group-17 or Halogen family

Question

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

Moderate

A

Cl₂
B

Br₂
C

I₂
D

F₂

Solution

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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