Which of the following is used to chemically test starch?

Correct option is B

The correct answer is (b) Iodine solution.
 Iodine solution is the most common chemical test for starch and turns a characteristic blue-black color in its presence.
 This reaction occurs due to the formation of an inclusion complex between starch and iodine molecules.
 The iodine which is the liquid that is used for the test is used to detect the presence of carbohydrates and thus the presence of starch.
 Food such as corn, wheat, rice, potatoes, etc. contains starch. In humans, starch is broken down into sugar molecules and supplies energy.
 Starch is the organic substance that is produced by the plants, it is granular and white.