Why we use iodine for showing presence of starch
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The iodine test is used to test for the presence of starch. Starch turns into an intense "blue-black" colour upon addition of aqueous solutions of the triiodide anion, due to the formation of an intermolecular charge-transfer complex. In the absence of starch, the brown colour of the aqueous solution remains.
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we use iodine to detect the presence of starch in a particular substance because iodine gives blue - black colour to the area which contains starch.
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