In starch-iodine test, the starch turns __________ color on addition of iodine.
Question and options
In starch-iodine test, the starch turns __________ color on addition of iodine.
- Purple
- Green
- Blue
- Pink
Answer and explanation
Correct answer: C - Blue
Iodine forms a polyiodide inclusion complex inside the amylose helix of starch, giving a deep blue (blue-black) colour. Amylopectin and glycogen, with shorter helical segments, give only reddish-purple or brown colours.
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