Question

Chemical reaction between starch and iodine:

A) Starch turns blue
B) Starch turns red
C) Starch turns yellow
D) Starch forms a precipitate

Answer 1

When starch reacts with iodine, it forms a blue-violet color due to the formation of the amylose-iodine complex.

Step-by-step explanation:

When starch reacts with iodine, it forms a blue-violet color due to the formation of the amylose-iodine complex. This color test is sensitive enough to detect even minute amounts of starch in solution. Therefore, the correct answer is A) Starch turns blue.