Question

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

Answer 1

Explanation:

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)

Answer 2

Starch gives blue black colour when tested with iodine. Among the given options, boiled & mashed potato and bread slice will have starch in them therefore, they will give blue black colour with iodine.