Question

Carbohydrates can be tested by using:

• A. Copper sulfate solution
• B. Iodine solution
• C. Caustic soda solution
• D. Both (a) and (b)

Answer 1

The correct option is B

Iodine solution

The correct option is (B):

Explanation of the correct option:

1. The presence of starch is tested with the help of an iodine test.
2. As the iodine solution is introduced in the sample, the regions with the presence of starch changes into blue-black color.
3. The blue-black color of the starch test indicates positive results for the presence of carbohydrates.

Explanation of the incorrect options:

Option (A):

Copper sulfate solution is used to test the protein contents of food.

Option (C):

Caustic soda is also used in the detection of proteins in food.

Final Answer: Carbohydrates can be tested by using iodine solution.