Question

when two drops of iodine solution are put on a substance we get blue black colours this indicates the presence of​

Answer 1

Answer:

starch

When few drops of iodine fall on starch substance, blue- black colour is observed. This is because of the formation of starch-iodine complex that gives blue colour. Thus, this property of Iodine is generally used to test the presence of starch.

Answer 2

Answer:

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