Questions
Which one of the following halogens turn(s) starch iodide paper blue?
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By Expert Faculty of Sri Chaitanya
a
Cl2
b
Br2
c
I2
d
F2
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Correct option is A
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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