Question

How is starch iodine fest performed, describe with suitable diagram.

Answer 1

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 solutionremains.

Answer 2

                     Starch iodine Test

• The iodine test is used to test for the existence of starch.  
• Starch revolve into an intense "blue-black colour" on the addition of tri-iodide aqueous solutions, due to the composition of an "intermolecular charge-transmission complex".
• In the absence of starch, the brown colour of the aqueous solution left over.
• Presence of starch in leaves can be certified by iodine test. Iodine turns starch solution into blue-black colour.
• Pour some few drops of "dilute iodine solution" on the "boiled leaf".
• The leaf turned into blue-black which certified the presence of starch in it. The starch is a carbohydrate.

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