Question

Food items Gives blue-black colour when iodine solution is added.
qa Gives purple colour when two drops of copper sulphate solution and 10 drops of caustic soda is added to it.
Oil stains are seen when rubbed on paper
Raw potato
Dried coconut
Peanuts
Milk
Gram flour
Boiled rice

say answer in yes or no
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Answer 1

Iodine test is used to determine the presence of starch in food items. If iodine is added to any food item and it causes the food item to turn to a blue-black colour. This indicates the presence of the nutrient called starch (carbohydrate).

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Answer 2

This indicates the presence of the nutrient called starch (carbohydrate).

Explanation:

1.Iodine test is used to determine the presence of starch in food items. If iodine is added to any food item and it causes the food item to turn to a blue-black colour. This indicates the presence of the nutrient called starch (carbohydrate).

2.Add Iodine-KI reagent to a solution or directly on a potato or other materials such as bread, crackers, or flour. A blue-black color results if starch is present. If starch amylose is not present, then the color will stay orange or yellow