Q.

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

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a

Cl2

b

Br2

c

I2

d

F2

answer is A.

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