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A leaf is boiled in water and spirit and iodine solution is dropper over it. Why does it turn blue – black ?



It is use to show present of starch in leaf.
No color change (Iodine Solution remains brown)

Iodine/Potassium Iodide solution changed from brown to blue- black (Starch is present)
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This concludes that the leaf contains STARCH.

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