A potato tuber has been cut into two halves. A few drops of iodine solution are placed on the cut surface of one of the halves. What colour change will be noticed?

A. From brown to blue-black

B. From brown to orange-red

C. From blue to pink

D. From pink to blue-green

Answer: Option A

Solution(By Examveda Team)

The Iodine test is used to test for the presence of starch. Iodine solution — iodine dissolved in an aqueous solution of potassium iodide — reacts with the starch producing a purple black colour.