The deep colour produced when iodine is dissolved in solution of pottasium iodide is caused by presence of
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Starch turns blue-black in the presence of iodine. Therefore, when the blue-black color disappears, the iodine has been completely reduced to the iodide ion. ... When starch is heated in water, various decomposition products are formed, among which is beta-amylose which forms a deep blue-black complex with iodine.
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