Q131
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
AnswerB.
From brown to orange-red
C.
From blue to pink
D.
From pink to blue-green
Answer: Option A
Solution
Answer: Option A
Solution:
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.