1.

Sudha took a small amount of an unknown food item in a test tube. Then, she added a few drops of iodine to it. The colour of the unknown food item changes to blue-black. The change in colour of the food item to blue-black indicates the presence of

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Sudha took a small amount of an unknown food item in a test tube. Then, she added a few drops of iodine to it. The colour of the unknown food item changes to blue-black.

The change in colour of the food item to blue-black indicates the presence of




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