Question

A. Choose the correct answer:
1. Which of the following turns blue-black on reacting with iodine solution?
a. Sugar
b. Starch
c. Protein
d. All of these​

Answer 1

Answer:

Starch

Explanation:

Starch (carbohydrate) is the mainly present in potato. Iodine solution is used to test the presence of starch in food materials. When iodine solution is added to a food item, it turns into blue-black colour if starch is present

Answer 2

Answer:

starch option (b)

Explanation:

Iodine solution is used to test the presence of starch in food materials. When iodine solution is added to a food item, it turns into blue-black colour if starch is present. If starch is not present, then the colour will stay orange or yellow.