Question

If iodine solution fall on our cloth why our cloth colour is changed black

Answer 1

Our clothes are in the form of starch . . Starch turns 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. This interaction between starch and triiodide is also the basis for iodometry.
So the iodine turn the colour of clothes blue-black .

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