Question

1 When iodine was added to an unknown food sample,the colour changed to blue black. Which nutrients is present in the food sample​

Answer 1

Answer:

In the presence of starch, iodine turns a blue/black colour. It is possible to distinguish starch from glucose (and other carbohydrates) using this iodine solution test. For example, if iodine is added to a peeled potato then it will turn black. Benedict's reagent can be used to test for glucose.

Explanation:

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Answer 2

Answer: Starch.

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