Question

Which chemical is used to test for starch? Which colour shows the presence of starch?

Answer 1

this is your answer Iodine solution, blue


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Answer 2

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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